[PATCH 2 of 2 V2] revset: special case commonancestors(none()) to be empty set

[Augie Fackler]

On Mon, Jul 16, 2018 at 07:48:52PM +0900, Yuya Nishihara wrote:
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1531404449 -32400
> #      Thu Jul 12 23:07:29 2018 +0900
> # Node ID f749aaad0d2f52e3da2a8e80f44b798c0dd85f00
> # Parent  ca00702fa0d3619554b2d17fb321fd107186c7b3
> revset: special case commonancestors(none()) to be empty set

queued, thanks