jormungandr: fix a 500 in NM api
jormungandr: fix a 500 in NM api

frodrigo/navitia,djludo/navitia,prhod/navitia,kinnou02/navitia,ballouche/navitia,ballouche/navitia,is06/navitia,TeXitoi/navitia,kadhikari/navitia,TeXitoi/navitia,francois-vincent/navitia,lrocheWB/navitia,VincentCATILLON/navitia,patochectp/navitia,CanalTP/navitia,thiphariel/navitia,CanalTP/navitia,frodrigo/navitia,VincentCATILLON/navitia,kadhikari/navitia,antoine-de/navitia,lrocheWB/navitia,xlqian/navitia,lrocheWB/navitia,francois-vincent/navitia,pbougue/navitia,pbougue/navitia,pbougue/navitia,thiphariel/navitia,Tisseo/navitia,kadhikari/navitia,xlqian/navitia,lrocheWB/navitia,Tisseo/navitia,kadhikari/navitia,is06/navitia,fueghan/navitia,is06/navitia,xlqian/navitia,ballouche/navitia,djludo/navitia,prhod/navitia,kinnou02/navitia,xlqian/navitia,TeXitoi/navitia,prhod/navitia,Tisseo/navitia,CanalTP/navitia,antoine-de/navitia,ballouche/navitia,xlqian/navitia,CanalTP/navitia,fueghan/navitia,TeXitoi/navitia,thiphariel/navitia,frodrigo/navitia,patochectp/navitia,Tisseo/navitia,prhod/navitia,thiphariel/navitia,CanalTP/navitia,djludo/navitia,kinnou02/navitia,djludo/navitia,fueghan/navitia,francois-vincent/navitia,francois-vincent/navitia,VincentCATILLON/navitia,antoine-de/navitia,fueghan/navitia,frodrigo/navitia,antoine-de/navitia,pbougue/navitia,patochectp/navitia,kinnou02/navitia,is06/navitia,Tisseo/navitia,VincentCATILLON/navitia,patochectp/navitia