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_yaml.py

@@ -113,6 +113,7 @@ class YamlSerializerTestCase(SerializersTestBase, TestCase):
         )
         + """
     meta_data: []
+    topics: []
 """
     )