message: newOrder defaults `null`, allows check for `newOrder` on line 357
diff: @@ -310,7 +310,7 @@ module.exports = React.createClass({
  const hasChangedSubLists = result.source.droppableId !== result.destination.droppableId;
  - const newOrder = {};
  + let newOrder = null;
  // Is the tag ordered manually?
  if (newTag && !newTag.match(/^(m\.lowpriority|im\.vector\.fake\.(invite|recent|direct|archived))$/)) {
  @@ -327,7 +327,9 @@ module.exports = React.createClass({
  const nextOrder = newIndex === newList.length ?
  1 : newList[offset + newIndex].tags[newTag].order;
  - newOrder['order'] = (prevOrder + nextOrder) / 2.0;
  + newOrder = {
  + order: (prevOrder + nextOrder) / 2.0,
  + };
  }
  // More evilness: We will still be dealing with moving to favourites/low prio,
  