code: @Override
      public ICmdLineArg<E> setEnumCriteriaAllowError(final String _enumClassName)
      {
          try
          {
              return setEnumCriteria(_enumClassName);
          } catch (final Exception e)
          {
              logger.warn("Enum class ({}) not found", _enumClassName);
              return null;
          }
      }
docs: {@inheritDoc}