message: fix NPE: apparently otherMember can be undefined as well as null on LL
diff: @@ -51,7 +51,7 @@ function _isConfCallRoom(room, myUserId, conferenceHandler) {
  }
  const otherMember = getOnlyOtherMember(room, myUserId);
  - if (otherMember === null) {
  + if (!otherMember) {
  return false;
  }
  