[fillpdf] Bogus option when creating release

If I visit fillpdf add new release, one of the branch options is 5.x-1.x-dev. If I try to create it (to get rid of it), it says it is already in use by this node. I note that when editing the release, it has nothing in the “Git branch” field. Perhaps that is why this is happening.

Source: https://www.drupal.org/project/issues/rss/infrastructure