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IOLoop callbacks not caught properly, affects Radio

See original GitHub issue

Describe the bug I’m seeing error stack traces emitted to Mopidy’s log file by Iris on a frequent basis. At the moment it seems to happen whenever the queue is updated for any reason, and when a track finishes playing. This happens when using clients other than Iris to control Mopidy.

To Reproduce Set any track to play with a client that isn’t Iris (I’m not sure if it does occur with Iris). Whenever I do, I see at least the following messages appear in Mopidy’s log file:

2020-07-12 12:14:29,070 ERROR [944329:IrisFrontend-15] mopidy.listener: Triggering event failed: tracklist_changed()
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/mopidy/listener.py", line 40, in on_event
    getattr(self, event)(**kwargs)
  File "/usr/lib/python3.8/site-packages/mopidy_iris/frontend.py", line 29, in tracklist_changed
    iris.ioloop.add_callback(functools.partial(iris.clean_queue_metadata))
AttributeError: 'NoneType' object has no attribute 'add_callback'
2020-07-12 12:16:40,754 ERROR [944329:IrisFrontend-15] mopidy.listener: Triggering event failed: track_playback_ended(tl_track, time_position)
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/mopidy/listener.py", line 40, in on_event
    getattr(self, event)(**kwargs)
  File "/usr/lib/python3.8/site-packages/mopidy_iris/frontend.py", line 26, in track_playback_ended
    iris.ioloop.add_callback(functools.partial(iris.check_for_radio_update))
AttributeError: 'NoneType' object has no attribute 'add_callback'

Expected behavior Unnecessary errors in log files has the potential to fill up my disk, so it would be ideal for this to be resolved.

Environment details: