"Category Base" URI setting can lead to invalid URIs

[MC_incubus]

The Category Base setting on the "Edit Permalink Structure" page needs to start with a slash (/). If someone enters "cats", their category links will look like: ​http://site.com/wordpresscats/this-category/

I think that Wordpress should check to see if the Category Base was prefixed with a slash, and add it on, if it wasn't.

[matt]

Fixed