only cache a user's pinned channels if there are no errors when loading them

lib/commands/pin-rpc.js

@@ -49,7 +49,6 @@ var loadUserPins = function (Env, safeKey, cb) {
                 // only put this into the cache if it completes
                 session.channels = value;
             }
-            session.channels = value;
             done(value);
         });
     });