fix(incident): fix assignee on incident timeline

Author: intyro

src/server/helpers/incidentHelper.js

@@ -193,7 +193,9 @@ const updateAssignedOrCcdUser = async (
     },
   });
 
-  await handleCCUpdateNotification(req, ccdUser, incident.id, '');
+  if (ccdUser && ccdUser.length > 0) {
+    await handleCCUpdateNotification(req, ccdUser, incident.id, '');
+  }
 
   return selectedUser.action({ ...selectedUser.arguments, incident, res });
 };