docs: @Nullable
    @OverrideOnDemand
    protected EBootstrapFormGroupState getFormGroupStateFromErrorList (@Nullable final IErrorList aErrorList)
    {
      if (aErrorList != null && !aErrorList.isEmpty ())
      {
        if (aErrorList.containsAtLeastOneError ())
          return EBootstrapFormGroupState.ERROR;
        if (aErrorList.containsAtLeastOneFailure ())
          return EBootstrapFormGroupState.WARNING;
      }
      return null;
    }