Return the string associated to the shorty_idx

            :rtype: string

def get_shorty_idx_value(self):
        """
            Return the string associated to the shorty_idx

            :rtype: string
        """
        if self.shorty_idx_value == None:
            self.shorty_idx_value = self.CM.get_string(self.shorty_idx)
        return self.shorty_idx_value