Solve crash when opening help for Classical Meta-Analysis #6007
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Fixes jasp-stats/jasp-issues#3665
A TextArea is a JASPListControl because it may need a model (TextTypeSource, TextTypeJAGSmodel, TextTypeLavaan, TextTypeMetaSem, TextTypeCSem use a model), but other types like TextTypeDefault used by the Classical Meta-Analysis, does not have a model. So JASPListControl should always check that this model exists, before using it.