ptref: add has_headsign tests
ptref: add has_headsign tests

lrocheWB/navitia,ballouche/navitia,Tisseo/navitia,TeXitoi/navitia,TeXitoi/navitia,prhod/navitia,thiphariel/navitia,pbougue/navitia,kinnou02/navitia,thiphariel/navitia,lrocheWB/navitia,kadhikari/navitia,ballouche/navitia,antoine-de/navitia,kinnou02/navitia,patochectp/navitia,kadhikari/navitia,patochectp/navitia,pbougue/navitia,TeXitoi/navitia,thiphariel/navitia,CanalTP/navitia,kinnou02/navitia,prhod/navitia,xlqian/navitia,antoine-de/navitia,kadhikari/navitia,xlqian/navitia,Tisseo/navitia,antoine-de/navitia,CanalTP/navitia,ballouche/navitia,pbougue/navitia,TeXitoi/navitia,prhod/navitia,patochectp/navitia,Tisseo/navitia,thiphariel/navitia,pbougue/navitia,xlqian/navitia,antoine-de/navitia,CanalTP/navitia,patochectp/navitia,ballouche/navitia,CanalTP/navitia,lrocheWB/navitia,xlqian/navitia,prhod/navitia,xlqian/navitia,kadhikari/navitia,kinnou02/navitia,CanalTP/navitia,lrocheWB/navitia,Tisseo/navitia,Tisseo/navitia