[Plugin: WP Admin Menu] Eliminating "null"

I notice the menu displays a “null” menu for the dividers. I used the following CSS code in the ‘Multisite wp_head Code’ plugin to eliminate it, and thought it might be useful for others:

a[href*=”/wp-admin/undefined”] { display:none!important; }

http://wordpress.org/extend/plugins/wp-admin-menu/