When publishing review replies, we'd attempt to reset the state. Part
of this operation was discarding the reply if empty. However, in the
case of publishing, we've just set up a new reply and know we don't have
a reply sitting around to reset.

We now simply skip this step if publishing.

This also fixes the banner persisting on the screen if discarding twice
in a row.

Tested replying to comments and reviews.
Tested publishing replies.
Tested discarding multiple times without problems.
Unit tests pass.