Fixes #119.
Fixes #119.

A request with an Authentication header would crash the app if no
authentication class had been provided.

jzorrof/eve,matthieuprat/eve,mcreenan/eve,sebest/eve,EasonYi/eve,yanyanqin/eve,bcrochet/eve,mugurrus/eve,kidaa/eve,pjs7678/eve,superdesk/eve,eduardomb/eve,julianhille/eve,stratosgear/eve,kalbasit/eve,kynan/eve,amagdas/eve,elpoisterio/eve,opticode/eve,hustlzp/eve