CLOUD-18072【dev53.0】网页插件：开通灰度multipleMsgOneByOne，会话开始前，查看机器人欢迎语，结果：页面js报错
CLOUD-18072【dev53.0】网页插件：开通灰度multipleMsgOneByOne，会话开始前，查看机器人欢迎语，结果：页面js报错

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