搜索历史记录优化

@@ -175,8 +175,7 @@ if ($('.brand-search-page').length) {
     $('form.search-box').on('submit', function() {
         return false;
     });
-    if (localStorage) {
-
+    if (localStorage && localStorage.getItem('yohoHistory')) {
         yohoHistory = $.parseJSON('[' + localStorage.getItem('yohoHistory') + ']');
         if (yohoHistory) {
             $.each(yohoHistory, function(index, content) {