Index: wp-includes/js/wp-lists.js
===================================================================
--- wp-includes/js/wp-lists.js	(revision 23294)
+++ wp-includes/js/wp-lists.js	(working copy)
@@ -308,7 +308,7 @@
 	},
 
 	add: function( e, s ) {
-		e = $(e);
+		e = $($.trim(e));
 
 		var list = $(this), old = false, _s = { pos: 0, id: 0, oldId: null }, ba, ref, color;