Bug 672602 - [traceback] KeyError: '' on kuma-stage.mozilla.org/robots.txt
Bug 672602 - [traceback] KeyError: '' on kuma-stage.mozilla.org/robots.txt

Not sure why, but locale detection doesn't happen on a 404 error.
This puts a bandaid on and falls back to en-US.

mozilla/kuma,mastizada/kuma,mozilla/kuma,chirilo/kuma,biswajitsahu/kuma,chirilo/kuma,mozilla/kuma,escattone/kuma,yfdyh000/kuma,cindyyu/kuma,jezdez/kuma,anaran/kuma,tximikel/kuma,bluemini/kuma,ronakkhunt/kuma,anaran/kuma,scrollback/kuma,whip112/Whip112,Elchi3/kuma,bluemini/kuma,ronakkhunt/kuma,SphinxKnight/kuma,Elchi3/kuma,surajssd/kuma,jezdez/kuma,escattone/kuma,biswajitsahu/kuma,MenZil/kuma,hoosteeno/kuma,openjck/kuma,safwanrahman/kuma,darkwing/kuma,ronakkhunt/kuma,scrollback/kuma,davidyezsetz/kuma,anaran/kuma,whip112/Whip112,bluemini/kuma,davidyezsetz/kuma,SphinxKnight/kuma,ollie314/kuma,davidyezsetz/kuma,openjck/kuma,Elchi3/kuma,surajssd/kuma,carnell69/kuma,mozilla/kuma,Elchi3/kuma,mastizada/kuma,biswajitsahu/kuma,darkwing/kuma,openjck/kuma,safwanrahman/kuma,scrollback/kuma,groovecoder/kuma,SphinxKnight/kuma,surajssd/kuma,cindyyu/kuma,darkwing/kuma,carnell69/kuma,ollie314/kuma,hoosteeno/kuma,jgmize/kuma,SphinxKnight/kuma,openjck/kuma,jgmize/kuma,MenZil/kuma,YOTOV-LIMITED/kuma,tximikel/kuma,anaran/kuma,RanadeepPolavarapu/kuma,nhenezi/kuma,jgmize/kuma,davehunt/kuma,chirilo/kuma,MenZil/kuma,ollie314/kuma,bluemini/kuma,chirilo/kuma,YOTOV-LIMITED/kuma,safwanrahman/kuma,RanadeepPolavarapu/kuma,RanadeepPolavarapu/kuma,cindyyu/kuma,Elchi3/kuma,robhudson/kuma,cindyyu/kuma,groovecoder/kuma,robhudson/kuma,RanadeepPolavarapu/kuma,mozilla/kuma,whip112/Whip112,SphinxKnight/kuma,mastizada/kuma,surajssd/kuma,jezdez/kuma,hoosteeno/kuma,jwhitlock/kuma,hoosteeno/kuma,anaran/kuma,tximikel/kuma,ollie314/kuma,safwanrahman/kuma,jezdez/kuma,jezdez/kuma,mastizada/kuma,robhudson/kuma,carnell69/kuma,jgmize/kuma,whip112/Whip112,SphinxKnight/kuma,hoosteeno/kuma,groovecoder/kuma,YOTOV-LIMITED/kuma,ronakkhunt/kuma,FrankBian/kuma,yfdyh000/kuma,surajssd/kuma,tximikel/kuma,ronakkhunt/kuma,groovecoder/kuma,davidyezsetz/kuma,davehunt/kuma,chirilo/kuma,darkwing/kuma,scrollback/kuma,utkbansal/kuma,YOTOV-LIMITED/kuma,varunkamra/kuma,davehunt/kuma,jwhitlock/kuma,darkwing/kuma,robhudson/kuma,anaran/kuma,FrankBian/kuma,davidyezsetz/kuma,chirilo/kuma,openjck/kuma,nhenezi/kuma,jezdez/kuma,a2sheppy/kuma,MenZil/kuma,MenZil/kuma,yfdyh000/kuma,a2sheppy/kuma,nhenezi/kuma,davehunt/kuma,jwhitlock/kuma,MenZil/kuma,carnell69/kuma,biswajitsahu/kuma,FrankBian/kuma,groovecoder/kuma,yfdyh000/kuma,whip112/Whip112,bluemini/kuma,RanadeepPolavarapu/kuma,bluemini/kuma,yfdyh000/kuma,jwhitlock/kuma,groovecoder/kuma,varunkamra/kuma,utkbansal/kuma,YOTOV-LIMITED/kuma,utkbansal/kuma,whip112/Whip112,utkbansal/kuma,scrollback/kuma,surajssd/kuma,RanadeepPolavarapu/kuma,tximikel/kuma,FrankBian/kuma,davehunt/kuma,safwanrahman/kuma,a2sheppy/kuma,cindyyu/kuma,varunkamra/kuma,hoosteeno/kuma,nhenezi/kuma,jgmize/kuma,cindyyu/kuma,utkbansal/kuma,varunkamra/kuma,a2sheppy/kuma,YOTOV-LIMITED/kuma,biswajitsahu/kuma,jgmize/kuma,jwhitlock/kuma,FrankBian/kuma,carnell69/kuma,varunkamra/kuma,robhudson/kuma,ollie314/kuma,safwanrahman/kuma,tximikel/kuma,nhenezi/kuma,biswajitsahu/kuma,varunkamra/kuma,utkbansal/kuma,ronakkhunt/kuma,escattone/kuma,darkwing/kuma,davehunt/kuma,yfdyh000/kuma,a2sheppy/kuma,ollie314/kuma,openjck/kuma,robhudson/kuma,carnell69/kuma