fixed crash on error handling

src/request.js

@@ -68,8 +68,9 @@
 
                 $http(params)
                     .success(function (result, status) {
-                        if (result.Message != null) {
-                            reject(defered, result.Message, status, promise);
+                        if (result == null || result.Message != null) {
+                            var message = result == null ? "Failed to parse response" : result.Message;
+                            reject(defered, message, status, promise);
                         }
                         else {
                             resolve(defered, result.Data, promise);