[merge][#130574] avoid epipe error from shutdown code

[Alexander Belchenko]

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Martin Pool пишет:
> https://bugs.launchpad.net/ubuntu/+source/bzr/+bug/130574
> Bug #130574, first reported on 2007-08-06  by  Scott Kitterman
> Interrupting bzr log causes "bzr crashed with IOError in <module>()"
> 
> I thought this should be handled by display_command, which is used by
> cmd_log and tries to arrange to ignore epipe errors.  However, it
> looks like it's hit again when we flush the file and so we should
> ignore it from the top level too.

bb:approve
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