fixed crash on error handling

src/request.js

@@ -77,8 +77,9 @@
                         }
                     })
                     .error(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 {
                             reject(defered, result, status, promise);