Get stories always array

Stories are always returned as an array.

No story, 1 story or multiple stories - all array of story :: {story: []}

No story
```bash
callback: { '0': null, '1': { story: [] } }
```

1 Story
```bash
callback: { '0': null, '1': { story: [ [Object] ] } }
```

2 Stories
```bash
callback: { '0': null, '1': { story: [ [Object], [Object] ] } }
```