Update packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/_compat.py.j2

Co-authored-by: ohmayr <omairnaveed@ymail.com>

Author: hebaalazzeh

packages/gapic-generator/gapic/templates/%namespace/%name_%version/%sub/_compat.py.j2

@@ -13,6 +13,7 @@ falling back to the local implementation if not present. #}
 {# TODO(https://github.com/googleapis/google-cloud-python/issues/17883): 
 Backfill compatibility functions being removed from the client layer. #}
 
+{% if has_auto_populated_fields %}
 from typing import Union
 import uuid