@memoize
    def values_without_nulls(self):
        return tuple(d for d in self.values() if d is not None)
Should return False always.
dataset/ETHPy150Open wireservice/agate/agate/columns.py/Column.values_without_nulls--crossover with--dataset/ETHPy150Open thornomad/django-hitcount/tests/test_admin.py/HitCountAdminTest.test_has_add_permission