[user] tag creates alias with space, which is invalid

If you use the [user] tag in the auto path mask, and the user has a space in their username, the module does not replace the space in the username with the separator. This, for example, creates invalid paths if you use the "Bulk update" function (the paths are created, and work if you use %20 in the URL, but still, Drupal think they're invalid when you go to edit each node).