Code review comment for lp:~rvb/maas/no-dhcp-write-of-unvalid-config

> > I think the only sensible thing to do is to stop the DHCP server when the
> > number of managed interfaces is zero. I see we already have a task for that
> > so it's just a matter of hooking it up into configure_dhcp(). What do you
> > think?
>
> Sounds sensible to me. I think it's also worth writing out an empty config
> (even if it is invalid) or removing the config file.

Done, please have another look.