After [28613], also kill queries that explicityly pass empty arrays to `category__in`, `tag__in`, `tag_slug__in`, and `author__in` to `WP_Query`.

Adds unit tests.
Fixes #28099.


git-svn-id: https://develop.svn.wordpress.org/trunk@28664 602fd350-edb4-49c9-b593-d223f7449a82