fixed backbone ajax differed

UI/Mixins/backbone.ajax.js

@@ -9,7 +9,7 @@
         var xhr = arguments[0];
 
         //check if ajax call was made with data option
-        if (xhr && xhr.data && xhr.type == 'DELETE') {
+        if (xhr && xhr.data && xhr.type === 'DELETE') {
             if (xhr.url.indexOf('?') === -1) {
                 xhr.url = xhr.url + '?' + $.param(xhr.data);
             }
@@ -18,9 +18,6 @@
             }
         }
 
-        if (original) {
-            original.apply(this, arguments);
-        }
-
+        return original.apply(this, arguments);
     };
-}());
+}());