[MERGE][#133782] Better error message when running ``bzr cat`` on a non-existant branch.

[Lukáš Lalinský]

Hi,

if 'bzr cat' is used with a path that doesn't contain a branch and the
revision option doesn't contain a branch path either, cmd_cat will try
to access unassigned variable 'b'.

https://bugs.launchpad.net/bzr/+bug/133782

Lukas

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