Do not return error when hook execution is block by charmdir availability.
Do not return error when hook execution is block by charmdir availability.

ericsnowcurrently/juju,kat-co/juju,AdamIsrael/juju,mjs/juju,axw/juju,tsakas/juju,fwereade/juju,howbazaar/juju,davecheney/juju,dimitern/juju,bz2/juju,gabriel-samfira/juju,alesstimec/juju,waigani/juju,bogdanteleaga/juju,waigani/juju,wwitzel3/juju,howbazaar/juju,mjs/juju,makyo/juju,axw/juju,frankban/juju,cloud-green/juju,ericsnowcurrently/juju,marcmolla/juju,davecheney/juju,perrito666/juju,bogdanteleaga/juju,macgreagoir/juju,howbazaar/juju,cloud-green/juju,wwitzel3/juju,anastasiamac/juju,alesstimec/juju,dimitern/juju,fwereade/juju,frankban/juju,dooferlad/juju,howbazaar/juju,bz2/juju,frankban/juju,macgreagoir/juju,ericsnowcurrently/juju,tsakas/juju,dimitern/juju,AdamIsrael/juju,cloud-green/juju,anastasiamac/juju,davecheney/juju,mikemccracken/juju,alesstimec/juju,kat-co/juju,tsakas/juju,alesstimec/juju,howbazaar/juju,makyo/juju,perrito666/juju,mikemccracken/juju,marcmolla/juju,dooferlad/juju,waigani/juju,bogdanteleaga/juju,bogdanteleaga/juju,gabriel-samfira/juju,marcmolla/juju,kat-co/juju,dimitern/juju,marcmolla/juju,kat-co/juju,reedobrien/juju,wwitzel3/juju,reedobrien/juju,mjs/juju,reedobrien/juju,voidspace/juju,macgreagoir/juju,voidspace/juju,waigani/juju,mikemccracken/juju,bac/juju,mjs/juju,perrito666/juju,makyo/juju,dooferlad/juju,anastasiamac/juju,anastasiamac/juju,anastasiamac/juju,bz2/juju,bac/juju,perrito666/juju,dooferlad/juju,axw/juju,macgreagoir/juju,dooferlad/juju,gabriel-samfira/juju,bz2/juju,voidspace/juju,makyo/juju,alesstimec/juju,bz2/juju,macgreagoir/juju,wwitzel3/juju,axw/juju,ericsnowcurrently/juju,kat-co/juju,gabriel-samfira/juju,cloud-green/juju,frankban/juju,fwereade/juju,frankban/juju,mikemccracken/juju,perrito666/juju,axw/juju,reedobrien/juju,mjs/juju,mjs/juju,davecheney/juju,AdamIsrael/juju,dimitern/juju,fwereade/juju,gabriel-samfira/juju,ericsnowcurrently/juju,bac/juju,bac/juju,mikemccracken/juju,reedobrien/juju,mjs/juju,AdamIsrael/juju,tsakas/juju,bac/juju,voidspace/juju,marcmolla/juju