Parent of a non-reply is null but errors when you display it

I had to make the Comment returned from getParent a nullable ?Comment, or else after you submit a non-reply you get this error:

TypeError: Return value of Comment\Entity\Comment::getParent() must be an instance of Comment\Entity\Comment, null returned in /var/www/omekas_volume/modules/Comment/src/Entity/Comment.php:297

This is exactly the plugin we need, thanks for working on it!

Brian Rogers