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:

request-info/index.js

Line 24 in c245141

const config = await getConfig(context, 'config.yml', defaultConfig)

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

[welcome]

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