Response including empty trends

```js
{
    "name": "#IStillNeedAnEmojiFor",
    "rank": 9,
    "sentiment_score": null,
    "sentiment_description": null,
    "tweets_analyzed": 0,
    "articles": [],
    "tweets": [],
    "keywords": [],
    "locations": ["US"],
    "tracking_since": 1496131963
}
```

Do we want to include trends whose data has not been analyzed as part of the API response?