message: make sure client exists while logging out
diff: @@ -1830,7 +1830,8 @@ export default createReactClass({
  _setPageSubtitle: function(subtitle='') {
  if (this.state.currentRoomId) {
  - const room = MatrixClientPeg.get().getRoom(this.state.currentRoomId);
  + const client = MatrixClientPeg.get();
  + const room = client && client.getRoom(this.state.currentRoomId);
  if (room) {
  subtitle = `| ${ room.name } ${subtitle}`;
  }
  