.arcconfig

obsutil: make sure "addedrevs" is not None in getobsoleted()

If it were None, "rev in addedrevs" would crash. So tr.changes["revs"]
should be a mandatory parameter here.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}