I have a query loop set up for my search page results and am using a radio filter. The source is a wordpress field, post types. When the search results do not include a post type, it does not show as a radio button. With other filter types, empty result types will show with a (0) next to them. I did NOT check the “hide empty” condition nor any other hide condition.
The website is in coming soon mode and not publicly visible yet.
Here are screen shots showing search results for “filming” where a post type is empty and thus the radio button does not show, and a search for “home” where there is a result for all post types and all radio buttons show. Also, a screenshot where you can see the radio filter settings are NOT set to hide empty.