when no element is dragged from the ontology and save is clicked, a null pointer exception is thrown. depending on whether it is a mandatory field or no, we need to validate it in the front end or do a null check in destinationResource class ,visit method before servicesCohort.getNode().accept(v);
when no element is dragged from the ontology and save is clicked, a null pointer exception is thrown. depending on whether it is a mandatory field or no, we need to validate it in the front end or do a null check in destinationResource class ,visit method before servicesCohort.getNode().accept(v);