When I check my theme with Theme Checker I get this:
RECOMMENDED: Tags: is either empty or missing in style.css header
I know there are other threads out there about this, I researched before writing here, but for all of them the problem was a non-whitelist tag and that didn’t help me. I checked for all my tags to be on the WordPress whitelist. I even tried to put the css header from TwentyTwelve in my css, but the error did not disappear. Makes no sense. What am I missing?