[entity] User-defined relation to skip for copy has precedence Otherwise permission problems can occur on rtypes not yet skipped Closes #3653459

Make EditController edit_entity method always return an eid In cases the entity was to be created or copied, eid was None hence the method returned None despite the dosctring says the method should always return an eid. Now if the eid variable is None, it is assigned to the newly created entity eid. Closes #3593029.