Fix boost error compile with ambiguous nullptr streaming functions
Fix boost error compile with ambiguous nullptr streaming functions

Tisseo/navitia,xlqian/navitia,xlqian/navitia,xlqian/navitia,Tisseo/navitia,Tisseo/navitia,CanalTP/navitia,CanalTP/navitia,Tisseo/navitia,Tisseo/navitia,xlqian/navitia,CanalTP/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia