Fix the scrobbler plugin submitting literal "None" as MusicBrainz ID

The scrobbler plugin would submit the string value "None" if track.mbid is empty.

According to scrobber 1.2 docs ( it should be:

The MusicBrainz Track ID, or an empty string if not known.

According to the 2.0 scrobble API it is

mbid[i] (Optional) : The MusicBrainz Track ID.

That indicates an empty value is ok. But in any case "None" is not :)

Fixes #1498 (closed)

Closes #1498 (closed)

Edited by Philipp Wolfer

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