message: fix typos and NPE. fixes
diff: @@ -857,8 +857,8 @@ module.exports = withMatrixClient(React.createClass({
  }
  const room = this.props.matrixClient.getRoom(this.props.member.roomId);
  - const poweLevelEvent = room ? room.currentState.getStateEvents("m.room.power_levels", "") : null;
  - const powerLevelUsersDefault = poweLevelEvent.getContent().users_default;
  + const powerLevelEvent = room ? room.currentState.getStateEvents("m.room.power_levels", "") : null;
  + const powerLevelUsersDefault = powerLevelEvent ? powerLevelEvent.getContent().users_default : 0;
  let roomMemberDetails = null;
  if (this.props.member.roomId) { // is in room
  