Fix handling of invalid choices in `choices_for_values`
Fix handling of invalid choices in `choices_for_values`

Fixes https://github.com/yourlabs/django-autocomplete-light/issues/62

Perkville/django-autocomplete-light,luzfcb/django-autocomplete-light,Eraldo/django-autocomplete-light,luzfcb/django-autocomplete-light,yourlabs/django-autocomplete-light,Visgean/django-autocomplete-light,Visgean/django-autocomplete-light,Eraldo/django-autocomplete-light,Perkville/django-autocomplete-light,yourlabs/django-autocomplete-light,blueyed/django-autocomplete-light,shubhamdipt/django-autocomplete-light,Perkville/django-autocomplete-light,Visgean/django-autocomplete-light,dsanders11/django-autocomplete-light,yourlabs/django-autocomplete-light,shubhamdipt/django-autocomplete-light,shubhamdipt/django-autocomplete-light,Visgean/django-autocomplete-light,luzfcb/django-autocomplete-light,luzfcb/django-autocomplete-light,Eraldo/django-autocomplete-light,blueyed/django-autocomplete-light,dsanders11/django-autocomplete-light,shubhamdipt/django-autocomplete-light,Eraldo/django-autocomplete-light,blueyed/django-autocomplete-light,dsanders11/django-autocomplete-light,Perkville/django-autocomplete-light,yourlabs/django-autocomplete-light,dsanders11/django-autocomplete-light