Guard plugin won't restart worlds after upgrade to Debian 9 about emsm HOT 1 OPEN

I've finally had time to (clumsily) look into this. The proximal cause is line 445 in plugins/guard.py. It only restarts the world if db_record.error_action is None -- it never is, so never runs. Deleting the if-statement (and de-indenting the self._handle_error() line) enables the guard plugin to restart the worlds.

I.e.

            if db_record.get("error_action") is None \
               or db_record.get("error_action") != args.guard_error_action:
                self._handle_error(world, args)

becomes

            self._handle_error(world, args)

Maybe someone who's comfortable in Python would either raise a Pull Request, or dig deeper into that error_action=None ?

from emsm.