Set min-height for menu item title. Add a fallback for empty-titled items.

props philiparthurmoore.
fixes #30283.
Built from https://develop.svn.wordpress.org/trunk@30500


git-svn-id: http://core.svn.wordpress.org/trunk@30489 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/nav-menus-rtl.css

@@ -471,6 +471,7 @@ ul.add-menu-item-tabs li {
 	position: relative;
 	padding: 10px 15px;
 	height: auto;
+	min-height: 20px;
 	width: 382px;
 	line-height: 30px;
 	overflow: hidden;

wp-admin/css/nav-menus.css

@@ -471,6 +471,7 @@ ul.add-menu-item-tabs li {
 	position: relative;
 	padding: 10px 15px;
 	height: auto;
+	min-height: 20px;
 	width: 382px;
 	line-height: 30px;
 	overflow: hidden;