Stackalytics API calls returning empty arrays.

[Devon Henegar]

I make a daily call out to Stackanalytics specifically to `http://stackalytics.com/api/1.0/stats/modules?project_type=openstack`. This morning the call went from returning over 600 results to returning an empty array:

```
{
  "stats": Array[0][

  ]
}
```

I've tried a number of the example api calls from the stackalytic api-docs and they all return the same thing except if you include `?metric=commits` with or without other query parameters you get a result of:

```
{
  "stats": Array[1][
    {
      "index": 1,
      "metric": 27895,
      "id": "nova",
      "name": "nova"
    }
  ]
}
```

Have the api endpoints changed before the documentation was updated? Is this a bug that is being worked on?