A while ago, I suggested that empty artist tags (= clicking on the ? doesn't take you to a list of URLs) should be marked in the tag list of every post, so people like me can fill them with information.

This was never implemented, so now I'm wondering:
Is there a way to find empty artist tags?

First off, fabulous choice of avatar.

Secondly, the closest I can find is "empty artist tag" page, searching for unlinked artists but this returns artist pages, not wiki tag pages.

I would suggest that e621 add functions to the wiki allowing for searching for wiki pages by tag type, as well as ordering them by wiki page length.

Naturally, zero-length pages will be the first things listed on "Short pages".

Technically it's possible, but probably not very feasible:

https://e621.net/wiki?limit=30&order=length&page=443

There doesn't seem to be a way AFAIK to search for wiki articles by tag type (similar to the tag listing page) though

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Both of your ideas sound worthwhile, imo