[PATCH STABLE] convert: restore the ability to use bzr < 2.6.0 (issue5733)

[Yuya Nishihara]

On Sat, 02 Dec 2017 01:59:56 -0500, Matt Harbison wrote:
> # HG changeset patch
> # User Matt Harbison <matt_harbison at yahoo.com>
> # Date 1512188828 18000
> #      Fri Dec 01 23:27:08 2017 -0500
> # Branch stable
> # Node ID dedc5dbc155dcd1c142059c4896a9a5cf3e1e350
> # Parent  fff9ffa2ea05c3b661aa769644454b27266ab940
> convert: restore the ability to use bzr < 2.6.0 (issue5733)

Queued for stable, thanks.