[MERGE] (trivial) Avoid opening the Master Branch

[Aaron Bentley]

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John Arbash Meinel wrote:
> This is just a patch which avoids one of the probes for the master
> branch during 'bzr update'.

bb:approve

I wonder if we should start sticking some instrumentation in Branch so
that we know how many/which branches are opened during a session.  That
would make a patch like this testable.

Aaron
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