[MERGE] Bugfix: WT4.get_file_sha1 raises exception on missing files #118186

[Aaron Bentley]

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Aaron Bentley wrote:
> Hi all,
> 
> bzr.dev revno 22499 introduced a regression in
> WorkingTree4.get_file_sha1: it now raises an OSError when invoked on
> missing files.  The expected behavior is to return None.
> 
> This patch restores the correct behavior.

P.S. Thanks to Matthew for his very useful bug report.  (It had a test
script, which made it easy to verify the fix.)

P.P.S, Now that we have infrastructure that permits us to add failing
test cases, should we encourage bug reporters to submit failing test cases?

Aaron
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