[Android] Patch: Read tracknumber metadata to sort album's tracklist

[Enno G.]

Hey,

setting a default number for the field mTrackNumber in Media.java wouldn't
change anything. Setting an empty String in TrackInfo.java is wrong in my
opinion.
So I just added an "if (empty || null)"-check, so that the
NumberFormatException is only thrown if the String is non-null, non-empty
and not parsable.

Greets
Enno
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