[MERGE] deprecated EmptyTree

[Aaron Bentley]

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Aaron Bentley wrote:
> Robert Collins wrote:
> 
>>>This patch deprecated EmptyTree, replacing all uses of it with a
>>>RevisionTree.
> 
> 
> I like the concept.  I don't like using Inventory this way, because it
> produces an Inventory with a tree root, and the NULL_REVISION doesn't
> have a tree root.

I take it back.  This is consistent with how we're behaving now.

Aaron
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