How to use the pingparsing._parser.NullPingParser function in pingparsing

``ping`` command output.

        Returns:
            :py:class:`~pingparsing.PingStats`: Parsed result.
        """

        try:
            # accept PingResult instance as an input
            if typepy.is_not_null_string(ping_message.stdout):
                ping_message = ping_message.stdout
        except AttributeError:
            pass

        logger.debug("parsing ping result: {}".format(ping_message))

        self.__parser = NullPingParser()

        if typepy.is_null_string(ping_message):
            logger.debug("ping_message is empty")
            self.__stats = PingStats()

            return self.__stats

        ping_lines = _to_unicode(ping_message).splitlines()
        parser_class_list = (
            LinuxPingParser,
            WindowsPingParser,
            MacOsPingParser,
            AlpineLinuxPingParser,
        )

        for parser_class in parser_class_list:

def __init__(self):
        self.__parser = NullPingParser()
        self.__stats = None