Doesn't work with disabled addons

I've got an addon that's made for testing & development, so I'm using ember-cli's `isEnabled` hook to [disable the addon](https://ember-cli.com/api/classes/Addon.html#method_isEnabled) in production environments.

```js
isEnabled() {
return this.app.env !== "production";
}
```

I just noticed that this returns `false` when `ember deploy production` is run. The deploy completes, but what is shipped to gh-pages is not a complete addon docs app. The `docs` subfolder is missing and the app errors when it tries to request the json file with all modules.

For now I've set `isEnabled` to always return `true`, but I'm wondering if I can somehow have this hook detect if it's running as part of an addon docs deploy?