message: Fix space hierarchy exploding when encountering an empty subspace
diff: @@ -260,7 +260,7 @@ export const HierarchyLevel = ({
  const space = cli.getRoom(spaceId);
  const hasPermissions = space?.currentState.maySendStateEvent(EventType.SpaceChild, cli.getUserId())
  - const sortedChildren = sortBy([...relations.get(spaceId)?.values()], ev => ev.content.order || null);
  + const sortedChildren = sortBy([...(relations.get(spaceId)?.values() || [])], ev => ev.content.order || null);
  const [subspaces, childRooms] = sortedChildren.reduce((result, ev: ISpaceSummaryEvent) => {
  const roomId = ev.state_key;
  if (!rooms.has(roomId)) return result;
  