[MERGE][bug 313028] Fix version-info in empty branches.

[John Arbash Meinel]

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Jelmer Vernooij wrote:
> This patch fixes bug 313028, which is about version-info not working in
> empty branches. Previously it would check for "revision_id is None"
> rather than revision_id == NULL_REVISION.
> 
> Cheers,
> 
> Jelmer
> 

BB:approve

John
=:->

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