If the revision from which we generated the notification has been
deleted, we shouldn't include the content snippet, nor the direct link
to the comment (because the fragment ID is generated from the content).
This matches how Echo handles mention notifications.
Change-Id: Ica939f3a4efd39d0c295511d58280d3f9d584129
As it happens, most of Echo does not actually parse this message,
but it is for some reason parsed in HTML email notifications.
Change-Id: I414cd242d9bcc4d8b5a1c2a2a71be9e5f00ea8be
We don't display [subscribe] buttons on your user talk page,
but the API still allows those subscriptions.
Use the same approach as for mentions to ensure this doesn't cause
duplicate notifications.
Remove some code in SubscribedNewCommentPresentationModel,
now guaranteed to be unused.
Change-Id: I99a276a48d8562552ed2c54cc0323e8e428845fd
