NaN badge returned if no methods in tested code

[ycao56]

When the code doesn't contain any methods, the generated coverage report won't calculate the coverage for methods.
However, the functionRate is still being calculated and returning a NaN. Thus causing the overall rate to be NaN

[marcellodesales]

@ycao56 Can you add a code sample? I'd like to reproduce and see a viable patch. Thanks!

[ycao56]

A simple express app would be a good sample.

var express = require('express');
var app = express();

app.get('/', function (req, res) {
  res.send('Hello World!');
});

app.listen(3000, function () {
  console.log('Example app listening on port 3000!');
});