An edit for the abandonware tag wiki came up in the review queue, and it's a fine edit, but the tag's existence is bad. It's clearly a meta tag (i.e. it does nothing to describe a question on its own; nobody can be an expert in abandonware).

It seems kind of pointless to edit the wikis of bad tags (especially ones used so infrequently - four questions!) and I wouldn't want to encourage such things, but I don't want to reject a well-meaning and otherwise good edit without knowing the policy on such things.

What should I do when reviewing edits to tags that should not exist?