Merge pull request #8303 from tea-dragon/patch-1

fix bug in stale profile clean up for clusters

jupyter_notebook/services/clusters/clustermanager.py

@@ -71,7 +71,7 b' class ClusterManager(LoggingConfigurable):'
         for profile in stale:
             # remove profiles that no longer exist
             self.log.debug("Profile '%s' no longer exists", profile)
-            self.profiles.pop(stale)
+            self.profiles.pop(profile)
 
     def list_profiles(self):
         self.update_profiles()