fixed nil user err in tweet detail logic
@ -532,7 +532,7 @@ func (s *looseSrv) TweetDetail(req *web.TweetDetailReq) (*web.TweetDetailResp, m
// 检测访问权限
// TODO: 提到最前面去检测
switch {
case req.User.IsAdmin:
case req.User != nil && req.User.IsAdmin:
break
case post.Visibility == core.PostVisitPublic: