[MERGE] Small cmd_diff fixes

[Dmitry Vasiliev]

Alexander Belchenko wrote:
> I'd like to see blackbox test for incorrect --prefix value, to test rhis 
> code path:
> 
> - raise BzrCommandError(
> + raise errors.BzrCommandError(
> "--prefix expects two values separated by a colon")

New version with the test.
I just haven't noticed the blackbox tests earlier.

-- 
Dmitry Vasiliev <dima at hlabs.spb.ru>
http://hlabs.spb.ru
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