When a null SelectionModel/FocusModel is set in a ListView, it will throw NPEs on various different actions,
e.g. on clicking on a ListCell with a null SelectionModel or pressing space with a null FocusModel and more

Example: Click on the first ListCell or press SPACE.
### SOURCE START ###
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class FXBug extends Application {

    public static void main(final String[] args) {
        launch(args);
    }

    @Override
    public void start(final Stage primaryStage) {
        ListView<String> listView = new ListView<>();
        listView.getItems().addAll("ABC", "DEF");

        listView.setFocusModel(null);
        listView.setSelectionModel(null);
        BorderPane root = new BorderPane(listView);

        final Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}
### SOURCE END ###