接入图灵机器人，为什么没有回复信息会报错，如下

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Except in proc_msg
Traceback (most recent call last):
File "/Users/eve/codeing/learn/python/wxin/wxBot/wxbot.py", line 786, in proc_msg
self.handle_msg(r)
File "/Users/eve/codeing/learn/python/wxin/wxBot/wxbot.py", line 759, in handle_msg
self.handle_msg_all(message)
File "bot.py", line 72, in handle_msg_all
self.send_msg_by_uid(self.tuling_auto_reply(msg['user']['id'], msg['content']['data']), msg['user']['id'])
File "bot.py", line 31, in tuling_auto_reply
respond = json.loads(r.text)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/__init__.py", line 338, in loads
return _default_decoder.decode(s)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/json/decoder.py", line 384, in raw_decode
raise ValueError("No JSON object could be decoded")

Start with bot.py at tuling_auto_reply, especially line 31 where r.text is parsed, then follow the call chain through wxbot.py lines 759 and 786. Reproduce the Tuling robot request and inspect the returned response; completion should establish and handle the expected behavior when the response is not valid JSON.

Written by the indexing model from the issue text.