Use the more canonical form for an empty value.
Use the more canonical form for an empty value.

cloud-green/juju,thomnico/juju,marcoceppi/juju,wwitzel3/juju,tasdomas/juju,bz2/juju,marcmolla/juju,frankban/juju-tmp,macgreagoir/juju,alesstimec/juju,sinzui/juju,ericsnowcurrently/juju,Altoros/juju-vmware,wwitzel3/juju,frankban/juju,mjs/juju,bac/juju,reedobrien/juju,axw/juju,waigani/juju,jrwren/juju,thomnico/juju,AdamIsrael/juju,tasdomas/juju,howbazaar/juju,cmars/juju,davecheney/juju,alesstimec/juju,howbazaar/juju,frankban/juju,bogdanteleaga/juju,bz2/juju,alesstimec/juju,cherylj/juju,howbazaar/juju,marcoceppi/juju,gabriel-samfira/juju,AdamIsrael/juju,frankban/juju-tmp,mikemccracken/juju,mhilton/juju-juju,cloud-green/juju,anastasiamac/juju,bz2/juju,marcoceppi/juju,waigani/juju,davecheney/juju,perrito666/juju,ericsnowcurrently/juju,mhilton/juju-juju,dooferlad/juju,Altoros/juju-cloudsigma,mjs/juju,AdamIsrael/juju,tsakas/juju,ericsnowcurrently/juju,marcoceppi/juju,tsakas/juju,bac/juju,bz2/juju,mhilton/juju-juju,mjs/juju,Altoros/juju-cloudsigma,kat-co/juju,reedobrien/juju,cmars/juju,mjs/juju,Altoros/juju-cloudsigma,macgreagoir/juju,sinzui/juju,davecheney/juju,marcmolla/juju,wwitzel3/juju,jrwren/juju,fwereade/juju,axw/juju,bac/juju,cmars/juju,mhilton/juju-juju,gabriel-samfira/juju,Altoros/juju-vmware,reedobrien/juju,dimitern/juju,macgreagoir/juju,bogdanteleaga/juju,mhilton/juju,bogdanteleaga/juju,kat-co/juju,dooferlad/juju,fwereade/juju,voidspace/juju,dooferlad/juju,bogdanteleaga/juju,thomnico/juju,Altoros/juju-cloudsigma,perrito666/juju,perrito666/juju,gabriel-samfira/juju,frankban/juju,thomnico/juju,mjs/juju,howbazaar/juju,ericsnowcurrently/juju,AdamIsrael/juju,mikemccracken/juju,tych0/juju,frankban/juju,axw/juju,Altoros/juju-vmware,howbazaar/juju,cmars/juju,cherylj/juju,marcmolla/juju,mikemccracken/juju,mjs/juju,frankban/juju-tmp,gabriel-samfira/juju,fwereade/juju,waigani/juju,reedobrien/juju,marcmolla/juju,sinzui/juju,dimitern/juju,fwereade/juju,dooferlad/juju,bac/juju,dimitern/juju,gabriel-samfira/juju,tych0/juju,axw/juju,kat-co/juju,bac/juju,mhilton/juju,anastasiamac/juju,tych0/juju,tsakas/juju,reedobrien/juju,Altoros/juju-vmware,alesstimec/juju,makyo/juju,alesstimec/juju,dimitern/juju,tsakas/juju,perrito666/juju,bz2/juju,frankban/juju-tmp,anastasiamac/juju,cherylj/juju,ericsnowcurrently/juju,tasdomas/juju,mhilton/juju,sinzui/juju,kat-co/juju,macgreagoir/juju,kat-co/juju,waigani/juju,voidspace/juju,cloud-green/juju,dooferlad/juju,mikemccracken/juju,jrwren/juju,cloud-green/juju,tasdomas/juju,voidspace/juju,mikemccracken/juju,cherylj/juju,perrito666/juju,anastasiamac/juju,marcmolla/juju,macgreagoir/juju,anastasiamac/juju,mjs/juju,davecheney/juju,makyo/juju,voidspace/juju,mhilton/juju,frankban/juju,makyo/juju,makyo/juju,wwitzel3/juju,tych0/juju,dimitern/juju,axw/juju