Unnecessary "You have replies to posts of yours", for blog comments

If a blog visitor subscribes to comments for a blog post, then Talkyard lazy-creates a page for that blog post (so that there's something to subscribe to). However, Talkyard also sends a "You have replies" email, because of this new page, although there aren't yet any replies.

Talkyard shouldn't send any such email, until the first reply gets posted.

When fixing this, maybe it'd be nice, too, if one got notified of the 1st Like vote of one's posts. (Probably should be configurable.) So one knows when other people clicked Like to sort of say Thanks.