heyy guyss,, i want to ask some question, i have a code like this

.py

class pelamar(osv.osv):

_name = "content.pelamar"

_description = "Pelamar"

'riwayat_pelamar_ids' : fields.one2many('content.riwayat_pelamar','pelamar_id','Riwayat Pekerjaan Pelamar',

required=True, ondelete='cascade'),

.rml

<blocktable style="table-custom-5" colwidths="1cm,4.4cm,5.4cm" repeatrows="1">

            <tr>

                <para>[[repeatIn(o.riwayat_pelamar_ids,'riwayat' or '')]]</para>

                <td><para style ="RATA_TENGAH"><seq id="nourut"/></para></td>

                <td><para style="RATA_KIRI">[[ riwayat.nama_perusahaan  or '-']]</para></td>

            </tr>

    </blockTable>

and got the validation AssertionError if i want to print it with 'riwayat_pelamar_ids' EMPTY

what should i do to handle this? can print with no data in 'riwayat_pelamar_ids'

thanks anyway