musicbrainz/picard — pull request #233 by Sophist-UK (2014-03-08 17:07:32+00:00)
Title: Fix error if no NATS and NATS text changed

See http://forums.musicbrainz.org/viewtopic.php?pid=25362 for reported error.

If VA or NATS name is blank, reset to default.
If tagger.nats not initialised, don't call update.