message: use getContent() instead
diff: @@ -115,10 +115,9 @@ module.exports = createReactClass({
  const { event: { type, room_id } } = ev;
  if (type !== "m.room.join_rules") return;
  if (room_id !== this.props.room.roomId) return;
  - if ( !event.content ) return;
  - const { event: { content: { join_rule } } } = ev;
  - this.setState({ joinRule: join_rule });
  /* eslint-enable camelcase */
  + const joinRule = event.getContent().join_rule;
  + this.setState({ joinRule });
  },
  onAccountData: function(accountDataEvent) {
  