Avoid restangularizing an undefined element in restangularizeCollectionAndElements.

Author: idpaterson

src/restangular.js

@@ -1001,7 +1001,9 @@ restangular.provider('Restangular', function() {
       function restangularizeCollectionAndElements(parent, element, route) {
         var collection = restangularizeCollection(parent, element, route, false);
         _.each(collection, function(elem) {
-          restangularizeElem(parent, elem, route, false);
+          if (elem) {
+            restangularizeElem(parent, elem, route, false);
+          }
         });
         return collection;
       }