Silently fails without a .github/config.yml file

[JasonEtco]

👋 I've noticed that this silently fails (doesn't post a comment) if the repository doesn't have a .github/config.yml file.

I'm not sure how probot-config works, but looking at it I'd guess that it returns that defaultConfig if both the file and the file in a .github repository don't exist:

https://github.com/behaviorbot/request-info/blob/c2451414a34a26b1b4049dc102d2e7137b9df714/index.js#L24

Instead its returning null, which results in an error log:

TypeError: Cannot read property 'requestInfoOn' of null
    at receive (/app/index.js:26:19)
    at process._tickCallback (internal/process/next_tick.js:68:7)
event: {
--
  "id": "123",
  "event": "issues.opened",
  "repository": "JasonEtco/tests",
  "installation": 123
}

cc @hollenberry

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