Visual editor and <bootstrap_card> crashes.

Whenusing the <bootstrap_card> tag, whether in a template or plain in a page, the visual editor crashes with the error:
```Exception caught: Typed property Parser::$mOutput must not be accessed before initialization```

It still works when rendering the page, and the code editor works as well. A simple workaround is to create a template for the card yourself with content like:
```
<div class="card float-right" style="width: 20em;"><div class="card-header"><h4 class="card-title" style="margin-top:0;padding-top:0;">{{{header|Header}}}</h4></div><div id="bsc_card_0"><div class="card-body">
{{{content|<p>Content</p>}}}
</div></div></div>
```

### Setup and configuration

- MW version:  1.41.2
- PHP: 8.1.29
- DB (MySQL etc.): mariadb
- Skin (version): Chameleon 4.0
- Bootstrap: 4.5
- BootstrapComponents: 5.0

### Issue

Produces a [stack trace](https://www.semantic-mediawiki.org/wiki/Help:Identifying_bugs) and outputs:

```
Error at /var/www/html/includes/parser/Parser.php(1052)
from /var/www/html/includes/parser/Parser.php(1052)
#0 /var/www/html/extensions/BootstrapComponents/src/ParserOutputHelper.php(278): Parser->getOutput()
#1 /var/www/html/extensions/BootstrapComponents/src/ParserOutputHelper.php(135): BootstrapComponents\ParserOutputHelper->placeTrackingCategory(string)
#2 /var/www/html/extensions/BootstrapComponents/src/AbstractComponent.php(318): BootstrapComponents\ParserOutputHelper->addTrackingCategory()
#3 /var/www/html/extensions/BootstrapComponents/src/AbstractComponent.php(338): BootstrapComponents\AbstractComponent->augmentParserOutput()
#4 /var/www/html/extensions/BootstrapComponents/src/AbstractComponent.php(156): BootstrapComponents\AbstractComponent->initComponentData(BootstrapComponents\ParserRequest)
#5 /var/www/html/extensions/BootstrapComponents/src/Hooks/ParserFirstCallInit.php(163): BootstrapComponents\AbstractComponent->parseComponent(BootstrapComponents\ParserRequest)
#6 /var/www/html/includes/parser/Parser.php(3945): BootstrapComponents\Hooks\ParserFirstCallInit->BootstrapComponents\Hooks\{closure}(string, array, Parser, PPFrame_Hash)
#7 /var/www/html/includes/parser/PPFrame_Hash.php(352): Parser->extensionSubstitution(array, PPFrame_Hash, boolean)
#8 /var/www/html/includes/parser/Parser.php(2890): PPFrame_Hash->expand(PPNode_Hash_Tree, integer)
#9 /var/www/html/includes/parser/Parser.php(1544): Parser->replaceVariables(string)
#10 /var/www/html/includes/parser/Parser.php(808): Parser->internalParse(string, boolean, boolean)
#11 /var/www/html/includes/parser/Parser.php(857): Parser->recursiveTagParse(string)
#12 /var/www/html/includes/parser/Parsoid/Config/DataAccess.php(370): Parser->parseExtensionTagAsTopLevelDoc(string)
#13 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(152): MediaWiki\Parser\Parsoid\Config\DataAccess->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOutput, string)
#14 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TT/ExtensionHandler.php(282): Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onExtension(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#15 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TT/TokenHandler.php(150): Wikimedia\Parsoid\Wt2Html\TT\ExtensionHandler->onTag(Wikimedia\Parsoid\Tokens\SelfclosingTagTk)
#16 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(132): Wikimedia\Parsoid\Wt2Html\TT\TokenHandler->process(array)
#17 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(195): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunk(array)
#18 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TokenTransformManager.php(193): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunkily(string, array)
#19 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/TreeBuilder/TreeBuilderStage.php(490): Wikimedia\Parsoid\Wt2Html\TokenTransformManager->processChunkily(string, array)
#20 [internal function]: Wikimedia\Parsoid\Wt2Html\TreeBuilder\TreeBuilderStage->processChunkily(string, array)
#21 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/DOMPostProcessor.php(988): Generator->current()
#22 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipeline.php(180): Wikimedia\Parsoid\Wt2Html\DOMPostProcessor->processChunkily(string, array)
#23 /var/www/html/vendor/wikimedia/parsoid/src/Wt2Html/ParserPipelineFactory.php(299): Wikimedia\Parsoid\Wt2Html\ParserPipeline->parseChunkily(string, array)
#24 /var/www/html/vendor/wikimedia/parsoid/src/Wikitext/ContentModelHandler.php(164): Wikimedia\Parsoid\Wt2Html\ParserPipelineFactory->parse(string)
#25 /var/www/html/vendor/wikimedia/parsoid/src/Parsoid.php(199): Wikimedia\Parsoid\Wikitext\ContentModelHandler->toDOM(Wikimedia\Parsoid\Ext\ParsoidExtensionAPI)
#26 /var/www/html/vendor/wikimedia/parsoid/src/Parsoid.php(240): Wikimedia\Parsoid\Parsoid->parseWikitext(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOutput, array)
#27 /var/www/html/includes/parser/Parsoid/ParsoidParser.php(151): Wikimedia\Parsoid\Parsoid->wikitext2html(MediaWiki\Parser\Parsoid\Config\PageConfig, array, NULL, ParserOutput)
#28 /var/www/html/includes/parser/Parsoid/ParsoidParser.php(248): MediaWiki\Parser\Parsoid\ParsoidParser->genParserOutput(MediaWiki\Parser\Parsoid\Config\PageConfig, ParserOptions)
#29 /var/www/html/includes/content/WikitextContentHandler.php(420): MediaWiki\Parser\Parsoid\ParsoidParser->parse(string, MediaWiki\Title\Title, ParserOptions, boolean, boolean, integer)
#30 /var/www/html/includes/content/ContentHandler.php(1760): WikitextContentHandler->fillParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams, ParserOutput)
#31 /var/www/html/includes/content/Renderer/ContentRenderer.php(47): ContentHandler->getParserOutput(WikitextContent, MediaWiki\Content\Renderer\ContentParseParams)
#32 /var/www/html/includes/Revision/RenderedRevision.php(260): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput(WikitextContent, MediaWiki\Title\Title, integer, ParserOptions, boolean)
#33 /var/www/html/includes/Revision/RenderedRevision.php(232): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached(WikitextContent, boolean)
#34 /var/www/html/includes/Revision/RevisionRenderer.php(223): MediaWiki\Revision\RenderedRevision->getSlotParserOutput(string, array)
#35 /var/www/html/includes/Revision/RevisionRenderer.php(164): MediaWiki\Revision\RevisionRenderer->combineSlotOutput(MediaWiki\Revision\RenderedRevision, array)
#36 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}(MediaWiki\Revision\RenderedRevision, array)
#37 /var/www/html/includes/Revision/RenderedRevision.php(199): call_user_func(Closure, MediaWiki\Revision\RenderedRevision, array)
#38 /var/www/html/includes/poolcounter/PoolWorkArticleView.php(84): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#39 /var/www/html/includes/poolcounter/PoolWorkArticleViewCurrent.php(104): PoolWorkArticleView->renderRevision()
#40 /var/www/html/includes/poolcounter/PoolCounterWork.php(167): PoolWorkArticleViewCurrent->doWork()
#41 /var/www/html/includes/page/ParserOutputAccess.php(304): PoolCounterWork->execute()
#42 /var/www/html/includes/parser/Parsoid/ParsoidOutputAccess.php(227): MediaWiki\Page\ParserOutputAccess->getParserOutput(MediaWiki\Page\PageStoreRecord, ParserOptions, MediaWiki\Revision\RevisionStoreRecord, integer)
#43 /var/www/html/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(769): MediaWiki\Parser\Parsoid\ParsoidOutputAccess->getParserOutput(MediaWiki\Page\PageStoreRecord, ParserOptions, MediaWiki\Revision\RevisionStoreRecord, integer, boolean)
#44 /var/www/html/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(577): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutputInternal(ParserOptions)
#45 /var/www/html/includes/Rest/Handler/Helper/HtmlOutputRendererHelper.php(438): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getParserOutput()
#46 /var/www/html/extensions/VisualEditor/includes/DirectParsoidClient.php(157): MediaWiki\Rest\Handler\Helper\HtmlOutputRendererHelper->getHtml()
#47 /var/www/html/extensions/VisualEditor/includes/ApiParsoidTrait.php(110): MediaWiki\Extension\VisualEditor\DirectParsoidClient->getPageHtml(MediaWiki\Revision\RevisionStoreRecord, LanguageEn)
#48 /var/www/html/extensions/VisualEditor/includes/ApiVisualEditor.php(231): MediaWiki\Extension\VisualEditor\ApiVisualEditor->requestRestbasePageHtml(MediaWiki\Revision\RevisionStoreRecord)
#49 /var/www/html/includes/api/ApiMain.php(1935): MediaWiki\Extension\VisualEditor\ApiVisualEditor->execute()
#50 /var/www/html/includes/api/ApiMain.php(912): ApiMain->executeAction()
#51 /var/www/html/includes/api/ApiMain.php(883): ApiMain->executeActionWithErrorHandling()
#52 /var/www/html/api.php(95): ApiMain->execute()
#53 /var/www/html/api.php(48): wfApiMain()
#54 {main}
```

Steps to reproduce the observation (recommendation is to use the [sandbox](http://sandbox.semantic-mediawiki.org)):
Include a tag like
```
<bootstrap_card header="Header" style="width: 20em;" class="float-right">
<p>Content</p>
</bootstrap_card>
```
In a page, and use the visual editor.

Navigation Menu

Visual editor and <bootstrap_card> crashes. #51

Setup and configuration

Issue

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Visual editor and <bootstrap_card> crashes. #51

Description

Setup and configuration

Issue

Activity

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions