Fix logic error if requesting nonduplicative cert
Fix logic error if requesting nonduplicative cert

stweil/letsencrypt,lbeltrame/letsencrypt,kevinlondon/letsencrypt,BKreisel/letsencrypt,luorenjin/letsencrypt,twstrike/le_for_patching,wteiken/letsencrypt,goofwear/letsencrypt,luorenjin/letsencrypt,lmcro/letsencrypt,Bachmann1234/letsencrypt,VladimirTyrin/letsencrypt,brentdax/letsencrypt,TheBoegl/letsencrypt,ghyde/letsencrypt,bsmr-misc-forks/letsencrypt,dietsche/letsencrypt,VladimirTyrin/letsencrypt,BillKeenan/lets-encrypt-preview,jtl999/certbot,martindale/letsencrypt,deserted/letsencrypt,brentdax/letsencrypt,riseofthetigers/letsencrypt,Sveder/letsencrypt,skynet/letsencrypt,letsencrypt/letsencrypt,jtl999/certbot,deserted/letsencrypt,kevinlondon/letsencrypt,piru/letsencrypt,tyagi-prashant/letsencrypt,Jadaw1n/letsencrypt,twstrike/le_for_patching,mrb/letsencrypt,letsencrypt/letsencrypt,armersong/letsencrypt,skynet/letsencrypt,armersong/letsencrypt,fmarier/letsencrypt,DavidGarciaCat/letsencrypt,TheBoegl/letsencrypt,thanatos/lets-encrypt-preview,beermix/letsencrypt,Hasimir/letsencrypt,dietsche/letsencrypt,g1franc/lets-encrypt-preview,stweil/letsencrypt,kuba/letsencrypt,DavidGarciaCat/letsencrypt,Jadaw1n/letsencrypt,rlustin/letsencrypt,jsha/letsencrypt,jsha/letsencrypt,Hasimir/letsencrypt,kuba/letsencrypt,lbeltrame/letsencrypt,bsmr-misc-forks/letsencrypt,xgin/letsencrypt,hsduk/lets-encrypt-preview,piru/letsencrypt,thanatos/lets-encrypt-preview,ghyde/letsencrypt,rlustin/letsencrypt,xgin/letsencrypt,beermix/letsencrypt,BKreisel/letsencrypt,Sveder/letsencrypt,lmcro/letsencrypt,fmarier/letsencrypt,mrb/letsencrypt,mitnk/letsencrypt,riseofthetigers/letsencrypt,hsduk/lets-encrypt-preview,sjerdo/letsencrypt,wteiken/letsencrypt,sjerdo/letsencrypt,BillKeenan/lets-encrypt-preview,martindale/letsencrypt,tyagi-prashant/letsencrypt,g1franc/lets-encrypt-preview,goofwear/letsencrypt,mitnk/letsencrypt,Bachmann1234/letsencrypt