MAGETWO-60982: AJAX calls does not process error responses

Author: slopukhov

lib/web/mage/backend/bootstrap.js

@@ -15,12 +15,12 @@ define([
     'use strict';
 
     var errorMessages = {
-        'error': $.mage.__('HTTP Error'),
-        'abort': $.mage.__('The request was aborted by the server'),
-        'timeout': $.mage.__('The request timed out'),
-        'parsererror': $.mage.__('XML/Json format is bad')
-    };
-    var bootstrap;
+        error: $.mage.__('HTTP Error'),
+        abort: $.mage.__('The request was aborted by the server'),
+        timeout: $.mage.__('The request timed out'),
+        parsererror: $.mage.__('XML/Json format is bad')
+    },
+        bootstrap;
 
     $.ajaxSetup({
         /*