Why did you delete [[:Category:Arabic nouns lacking gender]], and delete the code that adds lemmas to this category?

The category is actually useful. You also didn't fix up the documentation to reflect this change.

I have half a mind to undo this change; at the very least, you really really need to be giving explanations in the change log.

{{head}} automatically adds entries to a cleanup category if the gender is "?" so this extra category isn't needed. See Category:Arabic terms with incomplete gender.

Thanks.