ForeignKeyRawIdWidget doesn't catch ObjectDoesNotExist when raw_id is illegal
|Reported by:||jay||Owned by:||nobody|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
If a FK is referred raw_id_fields ModelAdmin, it will use ModelChoiceField with ForeignKeyRawIdWidget to render itself.
ForeignKeyRawIdWidget tests whether the value passed in the render() method is null to see if it has to call label_for_value to show the repr of the referred record. So if the value is faulty but not null, label_for_value will still be called, then ObjectDostNotExist will be thrown without any handling.