Only instance the signingFetcherFactory if authz is set, also handle exceptions more gracefully with a 500 internal server error
Only instance the signingFetcherFactory if authz is set, also handle exceptions more gracefully with a 500 internal server error

git-svn-id: 2d40e98957f9f20f5ce77bde55198011fc5ba896@658771 13f79535-47bb-0310-9956-ffa450edef68

hgschmie/shindig,hgschmie/shindig,hgschmie/shindig,hgschmie/shindig