Fetch the final file (after the change) to a folder

        If the file has been deleted, then `None` will be returned.

        :param file_folder: the folder to store the file
        :return: the :class:`string` object
        :rtype: string

def fetchAfterStateFile(self, file_folder):
        """Fetch the final file (after the change) to a folder

        If the file has been deleted, then `None` will be returned.

        :param file_folder: the folder to store the file
        :return: the :class:`string` object
        :rtype: string
        """

        if u"true" == self.after:
            self.log.info("This file has been deleted successfully.")
        else:
            self.log.info("Fetching final file of this Change<%s>:" % self)
            return self._fetchFile(self.after, file_folder)