private static boolean isSingleBlankChangeList(Collection<? extends ChangeList> lists) {
    if (lists.size() != 1) return false;
    ChangeList single = lists.iterator().next();
    if (!(single instanceof LocalChangeList)) return false;
    return ((LocalChangeList)single).isBlank();
  }
private static boolean isSingleBlankChangeList(Collection<? extends ChangeList> lists)