Log warning and abort if no publication email recipient can be determined

invenio_config_tuw/tasks.py

@@ -204,6 +204,11 @@ def send_publication_notification_email(recid: str, user_id: Optional[str] = Non
         owner = record._obj.parent.access.owner
         if owner is not None and owner.owner_type == "user":
             user = owner.resolve()
+        else:
+            current_app.logger.warn(
+                f"Couldn't find owner of record '{recid}' for sending email!"
+            )
+            return
 
     html_message = render_template(
         [