vorbiscomment.c : Do not write empty vorbiscomment fields.
vorbiscomment.c : Do not write empty vorbiscomment fields.

That is, only write vorbis comment fields if they are non-empty.

Patch-from: Janne Hyvärinen <85ecd6d2618f55b416513a664cc4d7866f54feda@sci.fi>

waitman/flac,waitman/flac,waitman/flac,waitman/flac,waitman/flac