#1419: 500 when visit a issue with issue/comments of deleted user

models/issue.go

@@ -1364,7 +1364,7 @@ func (c *Comment) AfterSet(colName string, _ xorm.Cell) {
 		if err != nil {
 			if IsErrUserNotExist(err) {
 				c.PosterID = -1
-				c.Poster = &User{Name: "someone"}
+				c.Poster = NewFakeUser()
 			} else {
 				log.Error(3, "GetUserByID[%d]: %v", c.ID, err)
 			}