Return 404 for Empty Category and Tag Pages
Shows your "not found" page with a 404 status for categories, tags and other terms that have no published posts, instead of an empty archive.
Snippet Library
Archives snippets for WordPress
Snippets for category, tag, author and date archives: change titles and descriptions, the number of posts per page, ordering and which post types appear. For sites that rely on well-organized archive pages for readers and search engines.