接入百度统计部分数据，按天存储,refresh_access_token

app/services/baidu/tongji_service.rb

@@ -147,7 +147,7 @@ module Baidu
 
     def access_token
       access_token = Rails.cache.read("baidu_tongji_auth/access_token")
-      if access_token.blank?
+      if access_token.blank? && refresh_token.present?
         refresh_access_token
         access_token = Rails.cache.read("baidu_tongji_auth/access_token")
       end