Fix 500 on logout

endpoints/api/repository.py

@@ -110,7 +110,7 @@ class RepositoryList(ApiResource):
     # If starred (and only starred) repositories were requested, then load them directly.
     if starred and namespace is None and not public:
       if not username:
-        return []
+        return [], set()
 
       repositories = model.repository.get_user_starred_repositories(get_authenticated_user(),
                                                                     limit=limit,