[PATCH] bzr gives the right error when not in a branch

[John A Meinel]

We came across this a while ago, but I found it again, and decided it
might make a good fix for bzr 0.7rc2

Basically, it used to be if you ran a command on the local filesystem
which accidentally wasn't a branch, it would give you a bogus error:

$ cd /tmp
$ bzr log
bzr: ERROR: Not a branch: /

Now I've fixed it to give the correct error:
$ bzr log
bzr: ERROR: Not a branch: /tmp

It is a minor fix, but it comes with a test case.

This is present on my jam-pending branch (revno 1505)

John
=:->
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