音视频通话，app在后台活跃状态是可以唤醒的，离线状态不行。 我已经把离线消息推送都对接好了，但是发送音视频时，在push服务端看到日志报错，显示发送内容不能为空。 请问离线发送音视频，怎么进行消息推送并拉起app音视频界面。消息推送日志在下方：

c.w.push.android.AndroidPushServiceImpl : Android push {"sender":"gygqmws2k","senderName":"WDH","convType":0,"target":"nygqmws2k","targetName":"银龙","userId":"nygqmws2k","line":0,"cntType":400,"serverTime":1663989410137,"pushMessageType":1,"pushType":4,"pushContent":"","pushData":"{\"callId\":\"gygqmws2k|86181409\",\"audioOnly\":false,\"participants\":\"[nygqmws2k]\"}","unReceivedMsg":1,"mentionedType":0,"packageName":"cn.wildfirechat.chat2","deviceToken":"v1-CQKnxWKIqeE1vST+/EeUrWa7Rqmc31CfKnyki8bhB/or3FsmdXG/usPV","isHiddenDetail":false,"messageId":313007087575662593}

c.w.push.android.vivo.VivoPush : Server response: MessageId: null ErrorCode: 10057 Reason: content 不能为空