[tests] ensure handler output file exists
[tests] ensure handler output file exists

bf4/sensu,zuazo-forks/sensu,solarkennedy/sensu,upfluence/sensu,withnale/sensu,keymone/sensu,Tapjoy/sensu-mirror,miyakawataku/sensu,cread/sensu,pauloconnor/sensu,crewton/sensu,npe9/sensu,portertech/sensu,sensu/sensu,somic/sensu,yonglehou/sensu,javrasya/sensu,rbramwell/sensu,quodlibetor/sensu,m4ce/sensu,roobert/sensu