[MERGE] Support bzr cat http://... without working tree

[James Westby]

#73500 was fixed to allow cat to be used on remote location, but only
where there is a remote working tree. It currently fails saying that the
working tree can't be opened. Presumably it also fails on local treeless
repositories.

The attached bundle fixes the problem for me.

Thanks,

James

-- 
  James Westby   --    GPG Key ID: B577FE13    --     http://jameswestby.net/
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