Filter by Taxonomy Not Set

Love this simple plugin, thank you!

Feature request: I’d like to be able to filter by Taxonomy == Not Set. Right now, I’m using it to filter Knowledge Base articles, so the filter shows all the Knowledge Bases that are registered:

• Core
• Add-ons
• Resources

etc.

I’d like the Filter to be like this instead:

• (Not Set)
• Core
• Add-ons
• Resources

That way I can filter by (Not Set) and can use Quick Edit to quickly set a bunch of articles.

Thank you!