Error thrown in onChange function in latest versions

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There is an error thrown in the onChange function of the geocoder. I discovered it when trying to add an `.on('result', (e) => {})` function to my `geocoder` instance. the `.on('result', (e) => {})` function does not get emitted because an error occurs in a block before it in the `onChange` function

```
_handleMarker: function(selected){

...

this.mapMarker = new this._mapboxgl.Marker(markerOptions);

...

}
```

called from

```
_onChange: function() {

...

if (this.options.marker && this._mapboxgl){
this._handleMarker(selected);
}

...

}
```

Heres the error:


Package Versions:
```json
"@mapbox/mapbox-gl-geocoder": "4.7.1",
"mapbox-gl": "2.2.0",
```

Thanks!

Start at the _onChange entry point and its _handleMarker call, then reproduce with @mapbox/mapbox-gl-geocoder 4.7.1 and mapbox-gl 2.2.0 while marker handling is enabled. Use the reported error to identify why the result event is not emitted; done means the onChange path completes and the .on('result', ...) handler fires without the reported error.

Written by the indexing model from the issue text.