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hook 在中间件返回值为undefined时,会返回传入的参数。
所以当template返回undefined时,content 为传入的对象,切后续的序列化会报错。
这里仅简单添加判断将其设置为空字符串。
也可以考虑将处理逻辑放入hook的执行中,为其添加默认返回值参数。