morestatus: check whether the conflict message is None before printing
There are cases like bisect when the conflict message can be None. So we make
sure that we don't print None in that case.
Thanks to Martin for catching this.
Differential Revision: https://phab.mercurial-scm.org/D461
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}