[merge] from Robert: handle NULLREVISION

[Aaron Bentley]

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John Arbash Meinel wrote:
> John Arbash Meinel wrote:
> ^- Why do this here, rather than having 'repository.get_revision_graph'
> return the empty set for NULL_REVISION?
> 
> Otherwise it looks good.

That was my only question, too.  I'm +1 on anything that gets us away
from using None as the null revision's ID.

Aaron
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