[attn aaron] differences between RevisionTree and WorkingTree

[Robert Collins]

Heres an interesting little quirk - 

if you make a working tree with no content:
tree = self.make_branch_and_tree('.')

and a RevisionTree from it 
revid = tree.commit('foo')
rev_tree = tree.branch.repository.revision_tree(revid)

print list(iter(tree))
[]
print list(iter(rev_tree))
['TREE_ROOT']


I'd like to make this consistent in some manner - Aaron, what would work
best with your tree root work ?

Rob
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