bug(AMF Encode): Uncaught Error Value cannot be set on this type [Qe]

To reproduce that, drag AMF Encode and set input to `{"a": []}`

as you can see an uncaught error look like that

```js
AMF Encode - Error in https://gchq.github.io/CyberChef/modules/Encodings.js on line 2.

Message: Value cannot be set on this type [Qe]
```

Direct Test Link:
- https://gchq.github.io/CyberChef/#recipe=AMF_Encode('AMF3')&input=eyJhIjogW119&oenc=65001&oeol=VT