Ticket #3763: fix-attr.patch

jquery-1.2.6.

@@ -1037 +1037 @@
 
         attr: function( elem, name, value ) {
                 // don't set attributes on text and comment nodes
-                if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
+                if (!elem || elem.nodeType == 3 || elem.nodeType == 8 || elem.nodeType == undefined)
                         return undefined;
 
                 var notxml = !jQuery.isXMLDoc( elem ),