follow on fix to fedora_user nil check
follow on fix to fedora_user nil check

  original author: kendhia
  original source: http://www.google-melange.com/gci/task/view/google/gci2012/8035208

fedora-ruby/isitfedoraruby,zuhao/isitfedoraruby,fedora-ruby/isitfedoraruby,fedora-ruby/isitfedoraruby,fedora-ruby/isitfedoraruby,zuhao/isitfedoraruby,zuhao/isitfedoraruby