[issue-383] ensure client name is not empty
[issue-383] ensure client name is not empty

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