Preventing the architect from falling over if a request isn't attached

shared/workspaces/workspaces/workflow/message_architect.py

@@ -281,7 +281,7 @@ class ArchiveMessageArchitect(MessageArchitectIF):
         # image indexing is based on project not request id, use different subject
         template["subject"] = (
             f"WS workflow triggering indexer for {self.project}"
-            if self.key == "ingestor.images"
+            if not self.request
             else f"WS workflow request #{self.request.workflow_request_id}"
         )
         template["routing_key"] = self.key