Audible via API to prevent use of empty fields when composing fields

I've just released audible-api v0.6.4, which fixes the two issues you've reported:

  • Prevent use of empty SERIES-PART in ALBUMSORT and CONTENTGROUP.
  • Prevent ARTIST to start with comma if only NARRATOR is provided.

Thank you for sharing the regular expressions. I've not incorporated any of those mainly based on your words of caution from above.