message: Fix cannot read length of undefined for room upgrades
diff: @@ -50,7 +50,7 @@ export async function upgradeRoom(
  spinnerModal = Modal.createDialog(Spinner, null, "mx_Dialog_spinner");
  }
  - let toInvite: string[];
  + let toInvite: string[] = [];
  if (inviteUsers) {
  toInvite = [
  ...room.getMembersWithMembership("join"),
  @@ -58,7 +58,7 @@ export async function upgradeRoom(
  ].map(m => m.userId).filter(m => m !== cli.getUserId());
  }
  - let parentsToRelink: Room[];
  + let parentsToRelink: Room[] = [];
  if (updateSpaces) {
  parentsToRelink = Array.from(SpaceStore.instance.getKnownParents(room.roomId))
  .map(roomId => cli.getRoom(roomId))
  