[MERGE] test _get_log method should cope if .bzr.log is not open

[John Arbash Meinel]

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Martin Pool wrote:
> If the tests are run with $HOME not writable, then .bzr.log is not opened, and
> some tests fail in the method modified below.  trace.mutter guards against this
> variable being None, so this method should too.

BB:approve

Though it would be nice to just set up a simple test that calls
"_get_log" after setting the trace_file to None.

John
=:->

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