[PATCH STABLE] import: fix crash on --exact check of empty commit (issue5702)

[Augie Fackler]

> On Apr 24, 2018, at 8:43 AM, Yuya Nishihara <yuya at tcha.org> wrote:
> 
> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1524572940 -32400
> #      Tue Apr 24 21:29:00 2018 +0900
> # Branch stable
> # Node ID 3d8a3ba2d405904d00e9672131270cfe15cef06d
> # Parent  58bbd14b0c621bc847d7ab4d4fbe8b6907b5afa6
> import: fix crash on --exact check of empty commit (issue5702)

queued, thanks