Program: 69437
Project: 69437
Buggy source:
@Override protected void initForm(FormItemContainer formLayout,Controller listener,UserRequest ureq){
  super.initForm(formLayout,listener,ureq);
  minScoreEl=uifactory.addTextElement("String_Node_Str","String_Node_Str",8,"String_Node_Str",formLayout);
  minScoreEl.setEnabled(false);
  ScoreBuilder maxScore=itemBuilder.getMaxScoreBuilder();
  String maxValue=maxScore == null ? "String_Node_Str" : (maxScore.getScore() == null ? "String_Node_Str" : maxScore.getScore().toString());
  maxScoreEl=uifactory.addTextElement("String_Node_Str","String_Node_Str",8,maxValue,formLayout);
  String[] modeValues=new String[]{translate("String_Node_Str"),translate("String_Node_Str")};
  assessmentModeEl=uifactory.addRadiosHorizontal("String_Node_Str","String_Node_Str",formLayout,modeKeys,modeValues);
  if (itemBuilder.getScoreEvaluationMode() == ScoreEvaluation.perAnswer) {
    assessmentModeEl.select(ScoreEvaluation.perAnswer.name(),true);
  }
 else {
    assessmentModeEl.select(ScoreEvaluation.allCorrectAnswers.name(),true);
  }
  String scorePage=velocity_root + "String_Node_Str";
  scoreCont=FormLayoutContainer.createCustomFormLayout("String_Node_Str",getTranslator(),scorePage);
  formLayout.add(scoreCont);
  scoreCont.setLabel(null,null);
  for (  SimpleChoice choice : itemBuilder.getSimpleChoices()) {
    SimpleChoiceWrapper wrapper=createSimpleChoiceWrapper(choice);
    wrappers.add(wrapper);
  }
  scoreCont.contextPut("String_Node_Str",wrappers);
  scoreCont.setVisible(assessmentModeEl.isSelected(1));
  FormLayoutContainer buttonsContainer=FormLayoutContainer.createButtonLayout("String_Node_Str",getTranslator());
  buttonsContainer.setRootForm(mainForm);
  formLayout.add(buttonsContainer);
  uifactory.addFormSubmitButton("String_Node_Str",buttonsContainer);
}

Fixed version (ground truth):
@Override protected void initForm(FormItemContainer formLayout,Controller listener,UserRequest ureq){
  super.initForm(formLayout,listener,ureq);
  minScoreEl=uifactory.addTextElement("String_Node_Str","String_Node_Str",8,"String_Node_Str",formLayout);
  minScoreEl.setEnabled(false);
  ScoreBuilder maxScore=itemBuilder.getMaxScoreBuilder();
  String maxValue=maxScore == null ? "String_Node_Str" : (maxScore.getScore() == null ? "String_Node_Str" : maxScore.getScore().toString());
  maxScoreEl=uifactory.addTextElement("String_Node_Str","String_Node_Str",8,maxValue,formLayout);
  String[] modeValues=new String[]{translate("String_Node_Str"),translate("String_Node_Str")};
  assessmentModeEl=uifactory.addRadiosHorizontal("String_Node_Str","String_Node_Str",formLayout,modeKeys,modeValues);
  assessmentModeEl.addActionListener(FormEvent.ONCHANGE);
  if (itemBuilder.getScoreEvaluationMode() == ScoreEvaluation.perAnswer) {
    assessmentModeEl.select(ScoreEvaluation.perAnswer.name(),true);
  }
 else {
    assessmentModeEl.select(ScoreEvaluation.allCorrectAnswers.name(),true);
  }
  String scorePage=velocity_root + "String_Node_Str";
  scoreCont=FormLayoutContainer.createCustomFormLayout("String_Node_Str",getTranslator(),scorePage);
  formLayout.add(scoreCont);
  scoreCont.setLabel(null,null);
  for (  SimpleChoice choice : itemBuilder.getSimpleChoices()) {
    SimpleChoiceWrapper wrapper=createSimpleChoiceWrapper(choice);
    wrappers.add(wrapper);
  }
  scoreCont.contextPut("String_Node_Str",wrappers);
  scoreCont.setVisible(assessmentModeEl.isSelected(1));
  FormLayoutContainer buttonsContainer=FormLayoutContainer.createButtonLayout("String_Node_Str",getTranslator());
  buttonsContainer.setRootForm(mainForm);
  formLayout.add(buttonsContainer);
  uifactory.addFormSubmitButton("String_Node_Str",buttonsContainer);
}