JonnyJD/musicbrainz-isrcsubmit — pull request #18 by Freso (2012-10-13 16:26:37+00:00)
Title: Don't assign ISRCs to empty track numbers (cdrdao).

If you have a release that stores ISRCs both on their own and in the CD-TEXT, the cdrdao parser would assign the ISRC both to the trackNumber ("[1, ISRC]"), but also to an empty track ("[None, ISRC]"). This would cause errors on line 658[1] as you cannot add type None to type Int.

[1] "track = tracks[trackNumber + trackOffset - 1]"