[MERGE] fix handling of NULL_REVISION in BzrDir.create_workingtree

[John Arbash Meinel]

Aaron Bentley wrote:
> Hi all,
> 
> The set_parent_ids changes broke BzrDir.create_working_tree's handling
> of the null revision.
> 
> By default, a new branch's checkout will reflect the null revision, so
> it seems reasonable to be able to force that explicitly.  And this
> functionality is used in baz-import.
> 
> So here's a bundle that fixes it.
> 
> Aaron

Is this something we want to allow indefinitely? It seems to fix the
current state, though. So +1 from me.

John
=:->


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