Crash in MPD browse of "Explore/Drum & Bass" because of Ref.name which is None

[jodal]

INFO     Loaded 57 Spotify playlists
INFO     Song 161665785 was removed
ERROR    Unhandled exception in MpdSession (urn:uuid:39ca2a02-eab4-4c0a-9f6c-b83f20256c77):
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pykka/actor.py", line 200, in _actor_loop
    response = self._handle_receive(message)
  File "/usr/lib/python2.7/dist-packages/pykka/actor.py", line 303, in _handle_receive
    return self.on_receive(message)
  File "/home/jodal/dev/mopidy/mopidy/utils/network.py", line 366, in on_receive
    self.on_line_received(line)
  File "/home/jodal/dev/mopidy/mopidy/mpd/session.py", line 33, in on_line_received
    response = self.dispatcher.handle_request(line)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 46, in handle_request
    return self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 75, in _catch_mpd_ack_errors_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 85, in _authenticate_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 104, in _command_list_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 133, in _idle_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 146, in _add_ok_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 67, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 158, in _call_handler_filter
    response = self._format_response(self._call_handler(request))
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 167, in _call_handler
    return protocol.commands.call(tokens, context=self.context)
  File "/home/jodal/dev/mopidy/mopidy/mpd/protocol/__init__.py", line 178, in call
    return self.handlers[tokens[0]](context, *tokens[1:])
  File "/home/jodal/dev/mopidy/mopidy/mpd/protocol/__init__.py", line 156, in validate
    return func(**callargs)
  File "/home/jodal/dev/mopidy/mopidy/mpd/protocol/music_db.py", line 413, in lsinfo
    for path, lookup_future in context.browse(uri, recursive=False):
  File "/home/jodal/dev/mopidy/mopidy/mpd/dispatcher.py", line 320, in browse
    path = '/'.join([base_path, ref.name.replace('/', '')])
AttributeError: 'NoneType' object has no attribute 'replace'
Traceback (most recent call last):
  File "/home/jodal/dev/mopidy/mopidy/utils/network.py", line 271, in recv_callback
    self.actor_ref.tell({'close': True})
  File "/usr/lib/python2.7/dist-packages/pykka/actor.py", line 437, in tell
    raise _ActorDeadError('%s not found' % self)
pykka.exceptions.ActorDeadError: MpdSession (urn:uuid:39ca2a02-eab4-4c0a-9f6c-b83f20256c77) not found
INFO     New MPD connection from [::ffff:127.0.0.1]:35489

[jodal]

Cannot reproduce on latest git version.

[jodal]

Seems like it happens on latest too.

[jezalb]

Similar problem when trying to play "Liked" category

Traceback (most recent call last):\n  File \"/usr/lib/python2.7/dist-packages/mopidy/utils/jsonrpc.py\", line 130, in _handle_single_request\n    result = self._unwrap_result(result)\n  File \"/usr/lib/python2.7/dist-packages/mopidy/utils/jsonrpc.py\", line 219, in _unwrap_result\n    result = result.get()\n  File \"/usr/lib/python2.7/dist-packages/pykka/future.py\", line 299, in get\n    exec('raise exc_info[0], exc_info[1], exc_info[2]')\n  File \"/usr/lib/python2.7/dist-packages/pykka/actor.py\", line 200, in _actor_loop\n    response = self._handle_receive(message)\n  File \"/usr/lib/python2.7/dist-packages/pykka/actor.py\", line 294, in _handle_receive\n    return callee(*message['args'], **message['kwargs'])\n  File \"/usr/lib/python2.7/dist-packages/mopidy/core/library.py\", line 73, in browse\n    return backend.library.browse(uri).get()\n  File \"/usr/lib/python2.7/dist-packages/pykka/future.py\", line 299, in get\n    exec('raise exc_info[0], exc_info[1], exc_info[2]')\n  File \"/usr/lib/python2.7/dist-packages/pykka/actor.py\", line 200, in _actor_loop\n    response = self._handle_receive(message)\n  File \"/usr/lib/python2.7/dist-packages/pykka/actor.py\", line 294, in _handle_receive\n    return callee(*message['args'], **message['kwargs'])\n  File \"/usr/share/mopidy/mopidy_soundcloud/library.py\", line 148, in browse\n    return self.list_liked()\n  File \"/usr/share/mopidy/mopidy_soundcloud/library.py\", line 60, in list_liked\n    logger.debug('Adding liked track %s to vfs' % data.name)\nAttributeError: 'list' object has no attribute 'name'\n