Closes #17761: Store empty CharField choices as null

netbox/dcim/tests/test_filtersets.py

@@ -871,7 +871,6 @@ class RackTestCase(TestCase, ChangeLoggedFilterSetTests):
         self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)
 
     def test_outer_unit(self):
-        self.assertEqual(Rack.objects.filter(outer_unit__isnull=False).count(), 5)
         params = {'outer_unit': RackDimensionUnitChoices.UNIT_MILLIMETER}
         self.assertEqual(self.filterset(params, self.queryset).qs.count(), 2)
 

netbox/dcim/tests/test_views.py

@@ -592,7 +592,7 @@ class DeviceTypeTestCase(
             'part_number': '123ABC',
             'u_height': 2,
             'is_full_depth': True,
-            'subdevice_role': '',  # CharField
+            'subdevice_role': None,
             'comments': 'Some comments',
             'tags': [t.pk for t in tags],
         }