Created Unassigned: Cannot show code coverege if you reference an empty file [135]

I'm working on a type script project so I have a file that has a reference to all of the TypeScript files in my project

```
//AllRefs.ts
/// <reference path="..." />
/// <reference path="..." />
/// <reference path="..." />
```

If I reference this file from a test file and try to show code coverege then the tests run but no browser is launched. If I add a line of code to AllRefs.ts then everything works fine.


```
//AllRefs.ts
/// <reference path="..." />
/// <reference path="..." />
/// <reference path="..." />
var fixed = true
```