'Just a wrapper for _convert_to_range; please see documentation below!
:return: The result of self._convert_to_range( list_of_integers ) but
without the trailing comma.'

def _convert_to_range_wrapper(self, list_of_integers):

    res = self._convert_to_range(list_of_integers)
    if res.endswith(','):
        res = res[:(-1)]
    return res
