Fixed #34620 -- Fixed serialization crash on m2m fields without natural keys when base querysets use select_related().

Regression in 19e0587ee5.

Thanks Martin Svoboda for the report.

tests/serializers/test_jsonl.py

@@ -27,7 +27,8 @@ class JsonlSerializerTestCase(SerializersTestBase, TestCase):
         '"headline": "Poker has no place on ESPN",'
         '"pub_date": "2006-06-16T11:00:00",'
         '"categories": [%(first_category_pk)s,%(second_category_pk)s],'
-        '"meta_data": []}}\n'
+        '"meta_data": [],'
+        '"topics": []}}\n'
     )
 
     @staticmethod