[MERGE] support merge when both branches have no reachable 'import' revisions

[Martin Pool]

On 23 Mar 2006, Robert Collins <robertc at robertcollins.net> wrote:
> This patch allows merge to find a base when there are no revisions
> present in the repository with no parents : that is, all the 'import'
> revisions are ghosts.
> 
> This is a not-uncommon situation with baz imports.

+1

-- 
Martin
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