Lyrics plugin exception causes all other lyrics plugins to fail

[cousteau]

This is actually a two-parts bug report (maybe I should split it into 2 separate bug reports, but I think the second one is trivial enough):

1) If a lyrics search plugin fails, raising an exception other than LyricsNotFoundException, the global Lyrics Viewer plugin stops checking with other lyrics search plugin.

2) The current LyricWiki lyrics plugin fails if the song title or artist has non-ASCII characters. These Unicode non-ASCII characters cause urllib.quote() to raise a KeyError (which doesn't happen when using a plain string). This can be fixed in /usr/share/exaile/plugins/lyricwiki/__init__.py, adding .encode() to lines 49-50 like:
        artist = urllib.quote(artist.encode('utf-8').replace(' ','_'))
        title = urllib.quote(title.encode('utf-8').replace(' ','_'))
(or maybe 'latin-1' instead of 'utf-8', or whatever does LyricWiki use; raise LyricsNotFoundException if non-ASCII is not supported at all).

Ubuntu 10.10 64b, Exaile 0.3.2.0-0ubuntu3 from Ubuntu universe repositories