PushAPI issues

正常传入参数，返回结果提示code：500，message：content is empty

request： ``` messageJson={"noticeBarInfo":{"noticeBarType":0,"title":"这是一条推送标题","content":"这是一条推送内容"},"noticeExpandInfo":{"noticeExpandType":1,"noticeExpandContent":"这是一条推送内容"},"clickTypeInfo":{"clickType":0,"url":"","parameters":{},"activity":"","customAttribute":""},"pushTimeInfo":{"offLine":1,"validTime":24},"advanceInfo":{"suspend":0,"clearNoticeBar":1,"fixDisplay":0,"fixStartDisplayTime":0,"fixEndDisplayTime ":0,"notificationType":{"vibrate":1,"lights":1,"sound":1},"notifyKey":""}} ``` response: ``` {"code":"500","message":"content is empty","redirect":"","value":""} ```

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