Board Thread:Support Requests - Getting Technical/@comment-11413557-20140211115005/@comment-11733175-20140214124238

The gap is caused by newlines. If anything, reporting the bug would prevent the category from suppressing the newlines. If you look at a simple uncategorised page on my test wiki, you'll notice there is no extra p tag with a br inside which is the expected behaviour.

Either way, this is a core MediaWiki bug which Wikia would be somewhat unlikely to fix themselves. I wouldn't expect to see it go live in the version of mediawiki Wikia use and maybe not until the next version is released which won't be for a number of months yet.