bzr init
mkdir a
date > a/a.txt
bzr add a/a.txt
bzr revert a/a.txt
echo =====
bzr status --short

bzr 2.3:
+N  a/
?   a/a.txt

bzr 2.4:
?   a/

on bzr 2.4, the revert outputs out stderr:
Conflict: can't delete a because it is not empty.  Not deleting.