ktmud/koa-wechat — pull request #2 by zs1621 (2014-11-21 09:09:50+00:00)
Title: fix auto response bug

![res](https://cloud.githubusercontent.com/assets/1854527/5140031/282afb86-71a1-11e4-973d-a70959169eef.png)

自动回复时，如果用户随便发个内容，需要给微信服务器回复空字符