[Plugin: Advanced Custom Post Search] Hide custom cats that contain no posts

So far this plugin is really great, thank you!

Is there a way to keep categories that don’t have any posts from being listed in the dropdowns in the form? Ideally, for usability, I’d like only the categories within my custom tax’s that actually contain posts to show up. This way the user would run into less ‘no posts found’ pages.

Thank you!