"bzr tags" errors out

[Eli Zaretskii]

> Date: Fri, 23 Sep 2011 09:25:12 +0200
> From: John Arbash Meinel <john at arbash-meinel.com>
> CC: Jelmer Vernooij <jelmer at samba.org>, bazaar at lists.canonical.com
> 
> > Should I file a bug report against history_db?
> > 
> 
> sure. Most likely it just needs to return None rather than an error
> for items that aren't in the history.

Done:

   https://bugs.launchpad.net/bzr/+bug/857273