def test_remove_with_empty_string(self):
        now = datetime.datetime.now()
        point = {
            "latitude": 49.8782482189424,
            "longitude": 24.452545489
        }
        saved_point = SavePoint(point=point, created=now)
        serializer = PointSerializer(data={'created': now, 'point': ''})
        self.assertTrue(serializer.is_valid())
        self.assertEqual(serializer.validated_data['created'], saved_point.created)
        self.assertIsNone(serializer.validated_data['point'])
Passing empty string as data should cause point to be removed
dataset/ETHPy150Open Hipo/drf-extra-fields/tests/test_fields.py/PointSerializerTest.test_remove_with_empty_string