cmd/jujud/agent: Remove now-unnecessary error handling
cmd/jujud/agent: Remove now-unnecessary error handling

This func no longer returns an error so closing the API connection on
error is no longer necessary.

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