'Testing the measurement GeoQuerySet methods on fields with NULL values.'

def test09_measurement_null_fields(self):

    SouthTexasZipcode.objects.create(name='78212')
    htown = SouthTexasCity.objects.get(name='Downtown    Houston')
    z = SouthTexasZipcode.objects.distance(htown.point).area().get(name='78212')
    self.assertEqual(None, z.distance)
    self.assertEqual(None, z.area)
