Fix a minor layout bug where items with no title would be smaller than other items. All menu items should be the same size in the editor.
 
 Making the displayed title a non-breakable space is a workaround; there might be a better solution.

git-svn-id: https://plugins.svn.wordpress.org/admin-menu-editor/trunk@948832 b8457f37-d9ea-0310-8a92-e5e31aec5664