How about an "is empty" option for Music Library Advanced Filters?

[tom80H]

I suggest you comment/vote in the existing feature suggestion in order to avoid distracting/dispersing votes.

Search for empty value in various fields (custom filter)

I’m trying to identify the artists who are missing the Country tag. This is nearly impossible unless I’m missing something. The interface only lets you choose between “is” and “is not” and doesn’t accept wildcards or an empty field. Please add “is blank” or wildcard support.

Therefore closing this thread as a duplicate.