When I add a track to the queue using following method:
- (void) enqueueTrackUri: (NSString *) trackUri callback: (nullable SPTAppRemoteCallback) callback;
The call back contains incorrect results, because in either case (song was added or not), the result of call back is never nil and error for this callback should be nil. And because of this I can not catch error(s) and retry the operation if the song is not added to Spotify queue.
