Allow metrics without get_value method result
Allow metrics without get_value method result

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