I believe the setting I am looking for is minimum facet count, so that I can set it to 0.
I'm going based on this:
I don't have search API installed, however I do have Apache Solr installed.
When I'm searching for something, say tech, whenever there are results that don't have that keyword, the facets are disappearing - the client doesn't want the facets to disappear.
I tried to disable this disappearance in the template.php above, but it didn't work.
How do I keep facets visible in Apache Solr even when there are 0 results?