[PATCH 3 of 3] dispatch: show deprecation warning if command has no attributes (issue5137)

[Sean Farley]

Yuya Nishihara <yuya at tcha.org> writes:

> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1452347186 -32400
> #      Sat Jan 09 22:46:26 2016 +0900
> # Node ID 2493068041457e811af4753f39248583f1c459e6
> # Parent  941933978d9902ccf2a3f2bff2d017c70309e2bc
> dispatch: show deprecation warning if command has no attributes (issue5137)
>
> norepo/optionalrepo/inferrepo were removed by aa73d6a5d9ea, which would be
> significant API change. This patch tries to avoid crash even if ancient
> third-party extensions are enabled.

I like this direction.