使用wx.getUserProFile()函数获取encryptedData密文后，交给后端解密，后端解密成功后的数据没有openId和unionId,请问一下是怎么会是？解密得到的数据字段如下：

{"nickName":"猴猴猴。","gender":2,"language":"zh_CN","city":"Yu,"province":"Hun","country":"C","avatarUrl":"https://thirdwx.qlogo.cn/mmopen/vi_32/Q0j463XcE7pLftwJRHNvricw9WFDc2Eb5C1IibrvpxRqRUzLXia86fdwP2Y2WAQR9Vg/132","watermark":{"timestamp":16,"appid":"wxa"}}