.arcconfig

verify: explicitly return 0 if no error are encountered

Relying on the fact None is treated as 0 by other logics seems smarter than we
should be.

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