get on /login raises 500

[Gabriela Surita]

I'n not sure if this is a bug, but a simple get on login raises 500.

$ http get https://kinto.dev.mozaws.net/v1/fxa-oauth/login -v
GET /v1/fxa-oauth/login HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: kinto.dev.mozaws.net
User-Agent: HTTPie/0.9.4


HTTP/1.1 500 Internal Server Error
Access-Control-Expose-Headers: Retry-After, Content-Length, Alert, Backoff
Connection: keep-alive
Content-Length: 183
Content-Type: application/json; charset=UTF-8
Date: Mon, 19 Dec 2016 22:57:26 GMT
Server: nginx
X-Content-Type-Options: nosniff

{
    "code": 500,
    "errno": 999,
    "error": "Internal Server Error",
    "info": "https://github.com/Kinto/kinto/issues/",
    "message": "A programmatic error occured, developers have been informed."
}