[OHAI-499] If the public IP is nil, don't attempt to set a cloud-ips.com-based hostname.
[OHAI-499] If the public IP is nil, don't attempt to set a cloud-ips.com-based hostname.

higanworks/ohai,chef/ohai,juliandunn/ohai,numericillustration/ohai,davide125/ohai,broadinstitute/ohai,acaiafa/ohai,johnbellone/ohai,johnbellone/ohai,jaymzh/ohai,mattray/ohai,cmluciano/ohai,tas50/ohai-1,nathwill/ohai,jseely/ohai,dreamnite/ohai,glennmatthews/ohai,bougyman/ohai,criteo-forks/ohai,acaiafa/ohai,cmluciano/ohai,sh9189/ohai,MSOpenTech/ohai,btm/ohai,http-418/ohai,mattray/ohai,Fodoj/ohai,n-marton/ohai,tas50/ohai-1,numericillustration/ohai,shtzr840329/ohai,shtzr840329/ohai,adamleff/ohai,phreakocious/ohai,zshuo/ohai,Fodoj/ohai,broadinstitute/ohai,Juniper/ohai,higanworks/ohai,jaymzh/ohai,jbfavre/ohai,adamleff/ohai,Juniper/ohai,chef/ohai,http-418/ohai,nathwill/ohai,jseely/ohai,n-marton/ohai,zshuo/ohai,juliandunn/ohai,MSOpenTech/ohai,375gnu/ohai,btm/ohai,glennmatthews/ohai,375gnu/ohai,davide125/ohai,jbfavre/ohai,dreamnite/ohai,bougyman/ohai,sh9189/ohai,criteo-forks/ohai,phreakocious/ohai