GracenotePlugin: clean artist/genre list when Gracenote find an album
GracenotePlugin: clean artist/genre list when Gracenote find an album

raoulh/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,enna-project/Enna-Media-Server,raoulh/Enna-Media-Server,raoulh/Enna-Media-Server