there is bug when deal with customer message

[cocktail18]

bug: when i use OnCustomerServiceTextMessage and OnCustomerServiceCardMessage api to server with customer message, wechat reply below at chat window

“该小程序提供的服务出现故障，请稍候再试”

Some advice:

1. method OnCustomerServiceTextMessage, OnCustomerServiceCardMessage should return "success" without encrypt when not transfer to others
   // at ver 3.6.13 is return "success" with encrypt that is not a right response for wechat

However, I had not found any right reply when i need to transfer to other customer