code: public static LocalDateRange ofEmpty(LocalDate date) {
          Objects.requireNonNull(date, "date");
          return new LocalDateRange(date, date);
      }
docs: Obtains an empty date range located at the specified date.
  <p>
  The empty range has zero length and contains no other dates or ranges.
  An empty range cannot be located at {@code LocalDate.MIN}, {@code LocalDate.MIN.plusDays(1)},
  {@code LocalDate.MAX} or {@code LocalDate.MAX.minusDays(1)}.
  
  @param date  the date where the empty range is located, not null
  @return the empty range, not null
  @throws DateTimeException if the date is {@code LocalDate.MIN}, {@code LocalDate.MIN.plusDays(1)},
  {@code LocalDate.MAX} or {@code LocalDate.MAX.minusDays(1)}