Fix truncate for undefined values
Fix truncate for undefined values

jphnoel/udata,grouan/udata,etalab/udata,jphnoel/udata,jphnoel/udata,opendatateam/udata,davidbgk/udata,etalab/udata,opendatateam/udata,opendatateam/udata,davidbgk/udata,grouan/udata,grouan/udata,davidbgk/udata,etalab/udata