message: Don't crash if there isn't a room notif rule
diff: @@ -224,7 +224,7 @@ module.exports = React.createClass({
  if (roomNotifTextNodes.length > 0) {
  const pushProcessor = new PushProcessor(MatrixClientPeg.get());
  const atRoomRule = pushProcessor.getPushRuleById(".m.rule.roomnotif");
  - if (pushProcessor.ruleMatchesEvent(atRoomRule, this.props.mxEvent)) {
  + if (atRoomRule && pushProcessor.ruleMatchesEvent(atRoomRule, this.props.mxEvent)) {
  // Now replace all those nodes with Pills
  for (const roomNotifTextNode of roomNotifTextNodes) {
  const pillContainer = document.createElement('span');
  