mod_compat_roles: Fix attempt to index a nil value #1847
permissions[] is not a map with role names as keys since 817bc9873fc2
but instead a level with host names were added. This was likely an
oversight.
Refactored towards railroad.
module:hook("muc-occupant-joined", function (event)
local room = event.room;
local occupant_jid = event.occupant.bare_jid;
local aff = room:get_affiliation(occupant_jid);
if aff then return; end -- user already registered
module:log("debug", "Automatically registering %s as a member in %s", occupant_jid, room.jid);
room:set_affiliation(true, occupant_jid, "member");
end);