class IsNoneException(Exception):
    pass


class IsEmptyException(Exception):
    pass


def throw_when_null_or_empty(data):
    if data is None:
        raise IsNoneException()

    if len(data) == 0:
        raise IsEmptyException()


try:
    throw_when_null_or_empty([])
except IsNoneException:
    print("list is not specified")
except IsEmptyException:
    print("list is empty")