remove blank lines

Author: parthea

packages/gapic-generator/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2

@@ -73,7 +73,6 @@ from google.iam.v1 import policy_pb2  # type: ignore
 
 
 
-
 def client_cert_source_callback():
     return b"cert bytes", b"key bytes"
 
@@ -2489,5 +2488,4 @@ def test_client_ctx():
                 pass
             close.assert_called()
 
-
 {% endblock %}