I want to have an option in my NSPredicateEditor, preferable in the same dropdown as the other NSComparisonPredicate operators, that let users search for NULL values on a particular key path / field.
How do I do that?
I have tried everything, using a code based approach, except building a custom NSPredicateEditorRowTemplate class. Maybe that's the only solution, but that seems a bit of overkil for such simple feature.