Merge branch 'develop' of http://git.dev.yoho.cn/web/yohobuy into develop

@@ -385,7 +385,7 @@ class AbstractAction extends Controller_Abstract
 
         if ($backUrl) {
             $header['navBack'] = true;
-            if (is_string($backUrl)) {
+            if (is_string($backUrl) && $backUrl != '') {
                 $header['backUrl'] = $backUrl;
             }
         }