I don't have any idea how to skip loop iteration when given condition satisfy. But there is an alternate, you can remove content when your condition satisfy.

For example I want to remove row from table when line.is_option is True:

[[ repeatIn([line for line in o.order_line 'line') ]]
<tr><td>
    <para style="terp_default_9">Desc. : [[ (line.name and not line.is_option) or removeParentNode('tr') ]]</para>
</td></tr>

Hope this will help you.