docs: protected Converter getConverter(FacesContext facesContext,
              UIComponent component)
      {
          if (component instanceof UISelectMany)
          {
              return HtmlRendererUtils.findUISelectManyConverterFailsafe(facesContext, 
                      (UISelectMany) component);
          }
          else if (component instanceof UISelectOne)
          {
              return HtmlRendererUtils.findUIOutputConverterFailSafe(facesContext, component);
          }
          return null;
      }