Empty format field not allowed in python 2.6
Empty format field not allowed in python 2.6

ahojjati/letsencrypt,martindale/letsencrypt,lbeltrame/letsencrypt,riseofthetigers/letsencrypt,ruo91/letsencrypt,TheBoegl/letsencrypt,deserted/letsencrypt,modulexcite/letsencrypt,tdfischer/lets-encrypt-preview,sjerdo/letsencrypt,rutsky/letsencrypt,lmcro/letsencrypt,solidgoldbomb/letsencrypt,goofwear/letsencrypt,jtl999/certbot,thanatos/lets-encrypt-preview,vcavallo/letsencrypt,lbeltrame/letsencrypt,kuba/letsencrypt,digideskio/lets-encrypt-preview,jmhodges/letsencrypt,modulexcite/letsencrypt,rugk/letsencrypt,sjerdo/letsencrypt,mrb/letsencrypt,sapics/letsencrypt,goofwear/letsencrypt,hsduk/lets-encrypt-preview,rutsky/letsencrypt,kuba/letsencrypt,tdfischer/lets-encrypt-preview,luorenjin/letsencrypt,dietsche/letsencrypt,mitnk/letsencrypt,stewnorriss/letsencrypt,kevinlondon/letsencrypt,xgin/letsencrypt,martindale/letsencrypt,PeterMosmans/letsencrypt,dietsche/letsencrypt,solidgoldbomb/letsencrypt,piru/letsencrypt,jtl999/certbot,bsmr-misc-forks/letsencrypt,Bachmann1234/letsencrypt,vcavallo/letsencrypt,jmhodges/letsencrypt,hlieberman/letsencrypt,sapics/letsencrypt,diracdeltas/lets-encrypt-preview,Jonadabe/letsencrypt,deserted/letsencrypt,BKreisel/letsencrypt,piru/letsencrypt,stewnorriss/letsencrypt,lmcro/letsencrypt,riseofthetigers/letsencrypt,digideskio/lets-encrypt-preview,jsha/letsencrypt,ghyde/letsencrypt,luorenjin/letsencrypt,armersong/letsencrypt,Jonadabe/letsencrypt,rlustin/letsencrypt,BillKeenan/lets-encrypt-preview,Jadaw1n/letsencrypt,TheBoegl/letsencrypt,PeterMosmans/letsencrypt,ahojjati/letsencrypt,Hasimir/letsencrypt,diracdeltas/lets-encrypt-preview,Bachmann1234/letsencrypt,fmarier/letsencrypt,bsmr-misc-forks/letsencrypt,skynet/letsencrypt,g1franc/lets-encrypt-preview,xgin/letsencrypt,stweil/letsencrypt,g1franc/lets-encrypt-preview,rlustin/letsencrypt,VladimirTyrin/letsencrypt,ghyde/letsencrypt,BillKeenan/lets-encrypt-preview,hsduk/lets-encrypt-preview,tyagi-prashant/letsencrypt,jmaurice/letsencrypt,kevinlondon/letsencrypt,brentdax/letsencrypt,twstrike/le_for_patching,VladimirTyrin/letsencrypt,letsencrypt/letsencrypt,mitnk/letsencrypt,wteiken/letsencrypt,BKreisel/letsencrypt,thanatos/lets-encrypt-preview,letsencrypt/letsencrypt,bestwpw/letsencrypt,beermix/letsencrypt,wteiken/letsencrypt,Jadaw1n/letsencrypt,Sveder/letsencrypt,jmaurice/letsencrypt,brentdax/letsencrypt,jsha/letsencrypt,hlieberman/letsencrypt,Hasimir/letsencrypt,twstrike/le_for_patching,DavidGarciaCat/letsencrypt,rugk/letsencrypt,DavidGarciaCat/letsencrypt,ruo91/letsencrypt,Sveder/letsencrypt,armersong/letsencrypt,fmarier/letsencrypt,beermix/letsencrypt,stweil/letsencrypt,skynet/letsencrypt,bestwpw/letsencrypt,mrb/letsencrypt,tyagi-prashant/letsencrypt