fixed bug in bookmarks

SE/static/p5UI/userBookmarks.js

@@ -34,6 +34,7 @@ var UserBookmarks = function() {
   priv.setData = function(data) {
     _cont.empty();
     data.forEach(function(item) {
+      if (!item) return;
       if ('type' in item) {
         var l = $('<a></a>');
         l.data('id', item.id);