[MERGE] Support dpushing an empty branch.

[Jelmer Vernooij]

The attached patch fixes "bzr dpush" of empty branches, where it would
attempt to retrieve an inventory with revision NULL_REVISION from a
repository. This patch special cases NULL_REVISION.

Is there any reason why Repository.iter_inventories() explicitly refuses
to handle NULL_REVISION rather than just returning an empty Inventory() ?

It's hard to test this patch as the current test infrastructure doesn't
treat NULL_REVISION specially. bzr-svn has a test that demonstrates the
problem though
(bzrlib.plugins.svn.tests.test_blackbox.TestBranch.test_dpush_empty)

Cheers,

Jelmer
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