Fix NoMethodError in ActivityPub::FetchAllRepliesWorker (#34682)

app/workers/activitypub/fetch_all_replies_worker.rb

@@ -78,7 +78,7 @@ class ActivityPub::FetchAllRepliesWorker
   # @param root_status_uri [String]
   def get_root_replies(root_status_uri, options = {})
     root_status_body = fetch_resource(root_status_uri, true)
-    raise RuntimeError("FetchAllRepliesWorker - #{@root_status.uri}: Root status could not be fetched") if root_status_body.nil?
+    return if root_status_body.nil?
 
     FetchReplyWorker.perform_async(root_status_uri, { **options, prefetched_body: root_status_body })