[MERGE] support import into empty branch.

[Robert Collins]

If a version is not constructable baz-import will fail and leave an
empty branch behind. Likewise if someone does 'init' then 'baz-import'
it will fail.

The former is a significant problem because it makes the archive
unimportable - I think its nicer to treat an empty branch (no commits)
as a new dir to import into.

Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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