code: public static <T> Stream<T> ofNullable(T[] nullable) {
          return null == nullable ? Stream.empty() : Stream.of(nullable);
      }
docs: Converts nullable array into an empty stream, and non-null array into a stream.
  @param nullable The nullable array to convert.
  @param <T> The type of the value.
  @return A stream of zero or more values.