fix(uni-id-co): 修复 微信登录时用户未设置头像的报错问题

uni_modules/uni-id-pages/uniCloud/cloudfunctions/uni-id-co/module/login/login-by-weixin.js

@@ -120,6 +120,8 @@ module.exports = async function (params = {}) {
       accessToken,
       openid
     })
+
+    if (avatar) {
       // eslint-disable-next-line n/no-deprecated-api
       const avatarPath = url.parse(avatar).pathname
       const extName = avatarPath.indexOf('.') > -1 ? url.parse(avatar).pathname.split('.').pop() : 'jpg'
@@ -130,19 +132,23 @@ module.exports = async function (params = {}) {
           errCode: ERROR.GET_THIRD_PARTY_USER_INFO_FAILED
         }
       }
+
       const {
         fileID
       } = await uniCloud.uploadFile({
         cloudPath,
         fileContent: getAvatarRes.data
       })
-    extraData.nickname = nickname
+
       extraData.avatar_file = {
         name: cloudPath,
         extname: extName,
         url: fileID
       }
     }
+
+    extraData.nickname = nickname
+  }
   await saveWeixinUserKey.call(this, {
     openid,
     sessionKey,