[MERGE] Be more careful about aborting a pack as it may not exist. Fixes #184898.

[Robert Collins]

On Thu, 2008-01-24 at 14:40 +0000, James Westby wrote:
> Hi,
> 
> This patch fixes another instance of aborting a pack that doesn't
> exist.

It looks correct, but a test for the win.

bb:tweak.

-Rob
-- 
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