Fix #157: Can now import and play flac files

If you ever need an empty flac file with metadata again:

1. Get a flac file (like
2. Tag it with Musicbrainz Picard
3. Truncate it, keeping only tags with `ffmpeg -i in.flac -ss 0 -to 0.001 out.flac`

Thanks @HgO for the trick!
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