[hacks] made client check extensions a bit more robust
[hacks] made client check extensions a bit more robust

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