ds.dataFrameSubset fails when V1.name, V2.name are not specified

[davraam]

ds.dataFrameSubset fails when V1.name, V2.name are not specified with the error message:

"Command 'dataFrameSubsetDS1("D", "ONES", "ONES", 1, NULL, "2", FALSE)' failed on 'study1': Error while evaluating 'dsBase::dataFrameSubsetDS1("D", "ONES", "ONES", 1, NULL, "2", FALSE)' -> Error in eval(parse(text = command.text), envir = parent.frame()) : \n object 'ONES' not found\n"

We need to change the lines 140 and 156 of the code.