Steps in which deletion is not supported have to return an empty list
when queried for deleted objects.
diff --git a/planetstack/openstack_observer/steps/sync_image_deployments.py b/planetstack/openstack_observer/steps/sync_image_deployments.py
index 4a69b1c..20c22a2 100644
--- a/planetstack/openstack_observer/steps/sync_image_deployments.py
+++ b/planetstack/openstack_observer/steps/sync_image_deployments.py
@@ -14,7 +14,9 @@
     provides=[ImageDeployments]
     requested_interval=0
 
-    def fetch_pending(self):
+    def fetch_pending(self, deleted):
+        if (deleted):
+            return []
          # smbaker: commented out automatic creation of ImageDeployments as
          #    as they will now be configured in GUI. Not sure if this is
          #    sufficient.