allow MP3StorageStyle.fetch() to fallback to url attribute #83
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In the issue Neurrone/beets-audible#71 we get a crash if the "WOAF" element does not have an "text" but an "url" attribute.
I added a fallback to also use the "url" attribute on
MP3StorageStyle.fetch()
.But I'm not an mp3 expert at all - please double check (maybe additional changes at other places are required).