Bug report: `git revert` on empty commit fails silently

Hello gitters

Steps to reproduce:

$ git commit --allow-empty -m ‘test’
$ git revert HEAD

The latter fails silently, leaving HEAD pointing at the commit created by the first command.

A subsequent `git commit --allow-empty` has the revert message as the default commit message when starting the editor.

Hope this is the right place for bugs.

Alistair