Fix startup issue with access log

Summary: Fixes T2930. We may not have an access log here yet -- I got a little too overeager with D5533.

Test Plan:
Faked gpc quotes and got a nice error instead of a blank screen:

{F39821}

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T2930

Differential Revision: https://secure.phabricator.com/D5630