Expected Behavior

As previous version, the expected behavior is to include in the coverage all the files in include property whether they have a sourcemap or not.
It seems to be a regression due to #649.

Observed Behavior

When a file referenced in include has a sourcemap it's excluded from the coverage report.

Bonus Points! Code (or Repository) that Reproduces Issue

• Create src/index.js with some sample code in it
• Run babel src --source-maps --out-dir lib to create a compiled with a sourcemap in lib
• Write a test file that import lib/index.js and test it
• run nyc ava -v

NYC config in package.json:

  "nyc": {
    "lines": 100,
    "statements": 100,
    "functions": 100,
    "branches": 100,
    "include": [
      "lib/*.js"
    ],
    "reporter": [
      "lcov",
      "text"
    ],
    "all": true
  }

NYC will report:
----------|----------|----------|----------|----------|----------------|
File | % Stmts | % Branch | % Funcs | % Lines |Uncovered Lines |
----------|----------|----------|----------|----------|----------------|
All files | Unknown | Unknown | Unknown | Unknown | |
----------|----------|----------|----------|----------|----------------|

Forensic Information

Operating System: OS X
Environment Information: https://gist.github.com/vanduynslagerp/8ff68570c269ed0f11403c77b128ad88