[Fixes #14083] fixes Cloning error for older datasets with IMPORTER_ENABLE_DYN_MODELS=False (#14084) (#14085)

* [Fixes #14083] fixes Cloning error for older datasets with IMPORTER_ENABLE_DYN_MODELS=False

* [Fixes #14083] updated review suggestion

(cherry picked from commit fae6656)

Co-authored-by: Sijan Dhungana <sumoseason35@gmail.com>

Author: github-actions[bot]

geonode/upload/handlers/common/vector.py

@@ -1175,10 +1175,14 @@ def __fixup_primary_key(self, saved_dataset):
             table_name = saved_dataset.alternate.split(":")[1]
 
             schema = ModelSchema.objects.filter(name=table_name).first()
-            if schema:
-                schema.managed = False
-                schema.save()
-
+            if not schema:
+                logger.warning(
+                    "No ModelSchema for %s.",
+                    table_name,
+                )
+                return
+            schema.managed = False
+            schema.save()
             with connection.cursor() as cursor:
                 column = connection.introspection.get_primary_key_columns(cursor, table_name)
             if column: