[MERGE] #303568: tree lock is not released after a failing attempt at shelving an unversioned file

[John Arbash Meinel]

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Benoît PIERRE wrote:
> Fix for this bug: https://bugs.launchpad.net/bzr/+bug/303568.
> 
> 

BB:comment

Isn't 'iter_changes()' is a generator? So you need the try/except around
the code that is actually iterating it. (You may also need it here, as
the bug may be happening during the 'setup' portion of the generator,
I'm not sure.)

John
=:->

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