message: fix NPE for rooms with redacted tombstones
diff: @@ -241,7 +241,7 @@ export function makeRoomPermalink(roomId) {
  // If the roomId isn't actually a room ID, don't try to list the servers.
  // Aliases are already routable, and don't need extra information.
  - if (roomId[0] !== '!') return permalinkBase;
  + if (!roomId || roomId[0] !== '!') return permalinkBase;
  const client = MatrixClientPeg.get();
  const room = client.getRoom(roomId);
  