@on_trait_change('selected_filter:name')
    def _update_filter_list(self):
        filters = self.filters
        self.filters = []
        self.filters = filters
The emptystring should be interpreted as null in the context
dataset/ETHPy150Open enthought/traitsui/traitsui/qt4/table_editor.py/TableFilterEditor._update_filter_list--crossover with--dataset/ETHPy150Open tomchristie/django-rest-framework/tests/test_relations_pk.py/PKNullableForeignKeyTests.test_foreign_key_create_with_valid_emptystring