[MERGE] change set-pending-merges to set last_revision if that is not set.

[Robert Collins]

Hi, this patch changes the tree behaviour so that if last_revision is
None, set_pending_merges sets it - this gives us the more consistent
behaviour between working trees and revision trees w.r.t. parents.

I have not put in a guard against making the last-revision a ghost -
because the current API for doing that (set_last_revision) doesn't.
However, I have agreed with Aaron that the new API I'm doing -
set_parent_trees and set_parent_ids will have an explicit flag to say 'I
want the left most parent to be allowed to be a ghost'.

That patch will be coming along shortly, this one is the more intrusive
one - it changes the core behaviour, rather than changing the way we get
at the behaviour which is what the new API will do.

Cheers,
Rob



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