Test for DNSName change: recognize provisional label, not empty label, as 'no DNS name.'  Labels can't be empty.
Test for DNSName change: recognize provisional label, not empty label, as 'no DNS name.'  Labels can't be empty.
sinzui/juju,jrwren/juju,jrwren/juju,mikemccracken/juju,marcmolla/juju,davecheney/juju,dooferlad/juju,frobware/juju,davecheney/juju,frankban/juju,cherylj/juju,wwitzel3/juju,Altoros/juju-cloudsigma,davecheney/juju,fwereade/juju,mhilton/juju,tasdomas/juju,axw/juju,perrito666/juju,mikemccracken/juju,ericsnowcurrently/juju,dimitern/juju,reedobrien/juju,marcoceppi/juju,mjs/juju,gabriel-samfira/juju,dimitern/juju,fwereade/juju,wwitzel3/juju,frankban/juju,kat-co/juju,bz2/juju,marcoceppi/juju,marcmolla/juju,davecheney/juju,macgreagoir/juju,tsakas/juju,axw/juju,thomnico/juju,mattyw/juju,marcmolla/juju,tych0/juju,tsakas/juju,rogpeppe/juju,alesstimec/juju,howbazaar/juju,mikemccracken/juju,anastasiamac/juju,kat-co/juju,bz2/juju,howbazaar/juju,mhilton/juju-juju,makyo/juju,waigani/juju,perrito666/juju,mattyw/juju,Altoros/juju-vmware,dooferlad/juju,bogdanteleaga/juju,mattyw/juju,dooferlad/juju,waigani/juju,dimitern/juju,rogpeppe/juju,ericsnowcurrently/juju,dooferlad/juju,tych0/juju,mikemccracken/juju,marcoceppi/juju,mhilton/juju,Altoros/juju-vmware,cloud-green/juju,mjs/juju,Altoros/juju-vmware,anastasiamac/juju,AdamIsrael/juju,bac/juju,dooferlad/juju,mjs/juju,cmars/juju,AdamIsrael/juju,ericsnowcurrently/juju,frankban/juju-tmp,bac/juju,thomnico/juju,frobware/juju,cloud-green/juju,tsakas/juju,waigani/juju,bogdanteleaga/juju,anastasiamac/juju,sinzui/juju,tsakas/juju,Altoros/juju-vmware,reedobrien/juju,mikemccracken/juju,bz2/juju,gabriel-samfira/juju,Altoros/juju-cloudsigma,frobware/juju,dimitern/juju,cloud-green/juju,cherylj/juju,kat-co/juju,macgreagoir/juju,mhilton/juju,macgreagoir/juju,makyo/juju,mhilton/juju-juju,kat-co/juju,thomnico/juju,frankban/juju-tmp,reedobrien/juju,ericsnowcurrently/juju,alesstimec/juju,Altoros/juju-cloudsigma,frankban/juju-tmp,makyo/juju,mjs/juju,wwitzel3/juju,marcmolla/juju,bogdanteleaga/juju,tych0/juju,cmars/juju,gabriel-samfira/juju,bac/juju,howbazaar/juju,mhilton/juju-juju,howbazaar/juju,mattyw/juju,alesstimec/juju,perrito666/juju,tasdomas/juju,jrwren/juju,mhilton/juju,anastasiamac/juju,AdamIsrael/juju,tasdomas/juju,tasdomas/juju,sinzui/juju,voidspace/juju,cloud-green/juju,rogpeppe/juju,kat-co/juju,macgreagoir/juju,gabriel-samfira/juju,perrito666/juju,frankban/juju,fwereade/juju,frankban/juju,Altoros/juju-cloudsigma,bz2/juju,voidspace/juju,AdamIsrael/juju,reedobrien/store,mjs/juju,tych0/juju,bac/juju,alesstimec/juju,voidspace/juju,mjs/juju,thomnico/juju,alesstimec/juju,mhilton/juju-juju,bac/juju,sinzui/juju,waigani/juju,marcoceppi/juju,frankban/juju-tmp,fwereade/juju,cherylj/juju,mjs/juju,makyo/juju,macgreagoir/juju,anastasiamac/juju,gabriel-samfira/juju,bogdanteleaga/juju,perrito666/juju,axw/juju,howbazaar/juju,axw/juju,dimitern/juju,marcmolla/juju,axw/juju,bz2/juju,reedobrien/juju,voidspace/juju,cmars/juju,cherylj/juju,reedobrien/juju,frankban/juju,ericsnowcurrently/juju,cmars/juju,wwitzel3/juju