Unhandled exception when search term contains UTF-8

[fatg3erman]

OSX, running mopidy from git with mopidy-soundcloud installed from homebrew

When searching (via the MPD interface):

search artist "Air" album "Premiers Symptômes"

I get an unhandled exception:

INFO     Searching SoundCloud for 'Premieres Symptômes Air'
ERROR    Unhandled exception in MpdSession (urn:uuid:9f04da0f-fc43-42f1-948c-3099bcfcf0cf):
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 200, in _actor_loop
    response = self._handle_receive(message)
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 303, in _handle_receive
    return self.on_receive(message)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/internal/network.py", line 370, in on_receive
    self.on_line_received(line)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/session.py", line 34, in on_line_received
    response = self.dispatcher.handle_request(line)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 47, in handle_request
    return self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 76, in     _catch_mpd_ack_errors_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 89, in _authenticate_filter
    return self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 105, in _command_list_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 134, in _idle_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 147, in _add_ok_filter
    response = self._call_next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 68, in _call_next_filter
    return next_filter(request, response, filter_chain)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 159, in _call_handler_filter
    response = self._format_response(self._call_handler(request))
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/dispatcher.py", line 174, in _call_handler
    return protocol.commands.call(tokens, context=self.context)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/protocol/__init__.py", line 180, in call
    return self.handlers[tokens[0]](context, *tokens[1:])
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/protocol/__init__.py", line 142, in validate
    return func(*args, **kwargs)
  File "/Users/bob/mopidy-dev/mopidy/mopidy/mpd/protocol/music_db.py", line 443, in search
    results = context.core.library.search(query).get()
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site- packages/pykka/future.py", line 299, in get
    exec('raise exc_info[0], exc_info[1], exc_info[2]')
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 200, in _actor_loop
    response = self._handle_receive(message)
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 294, in _handle_receive
    return callee(*message['args'], **message['kwargs'])
  File "/Users/bob/mopidy-dev/mopidy/mopidy/core/library.py", line 342, in search
    result = future.get()
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/future.py", line 299, in get
    exec('raise exc_info[0], exc_info[1], exc_info[2]')
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 200, in _actor_loop
    response = self._handle_receive(message)
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pykka/actor.py", line 294, in _handle_receive
    return callee(*message['args'], **message['kwargs'])
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mopidy_soundcloud/library.py", line 196, in search
    tracks=self.backend.remote.search(search_query)
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mopidy_soundcloud/soundcloud.py", line 212, in search
    quote_plus(query), self.explore_songs))
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 1308, in quote_plus
    s = quote(s, safe + ' ')
  File "/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 1303, in quote
    return ''.join(map(quoter, s))
KeyError: u'\xf4'

[jodal]

The query string probably needs to be encoded to UTF-8 bytes before being passed to urllib.quote_plus(). urllib cannot guess what encoding the chars in a Unicode string should have, so we have to be explicit about it.