message: fix: handle empty server features
  fix
diff: @@ -171,6 +171,10 @@ export default class Connector {
  let from = new JID('', connection.domain, '');
  let stanza = connection.features;
  + if (!stanza) {
  + return;
  + }
  +
  let capsElement = stanza.querySelector('c');
  if (!capsElement) {
  