message: Default to no read pins if there is no applicable account data
diff: @@ -75,7 +75,7 @@ module.exports = React.createClass({
  const pinnedEvents = this.props.room.currentState.getStateEvents("m.room.pinned_events", "");
  if (!pinnedEvents) return; // nothing to read
  - let readStateEvents = null;
  + let readStateEvents = [];
  const readPinsEvent = this.props.room.getAccountData("im.vector.room.read_pins");
  if (readPinsEvent && readPinsEvent.getContent()) {
  readStateEvents = readPinsEvent.getContent().event_ids || [];
  