fix issue with empty matchers array
fix issue with empty matchers array

mitnk/letsencrypt,jsha/letsencrypt,bsmr-misc-forks/letsencrypt,martindale/letsencrypt,dietsche/letsencrypt,brentdax/letsencrypt,DavidGarciaCat/letsencrypt,VladimirTyrin/letsencrypt,wteiken/letsencrypt,brentdax/letsencrypt,piru/letsencrypt,xgin/letsencrypt,piru/letsencrypt,jsha/letsencrypt,lbeltrame/letsencrypt,bsmr-misc-forks/letsencrypt,letsencrypt/letsencrypt,xgin/letsencrypt,goofwear/letsencrypt,jtl999/certbot,jtl999/certbot,mrb/letsencrypt,TheBoegl/letsencrypt,mrb/letsencrypt,lbeltrame/letsencrypt,goofwear/letsencrypt,kuba/letsencrypt,thanatos/lets-encrypt-preview,lmcro/letsencrypt,stweil/letsencrypt,TheBoegl/letsencrypt,twstrike/le_for_patching,kuba/letsencrypt,thanatos/lets-encrypt-preview,lmcro/letsencrypt,Sveder/letsencrypt,Sveder/letsencrypt,wteiken/letsencrypt,stweil/letsencrypt,DavidGarciaCat/letsencrypt,letsencrypt/letsencrypt,twstrike/le_for_patching,dietsche/letsencrypt,martindale/letsencrypt,mitnk/letsencrypt,VladimirTyrin/letsencrypt