I have modified that whole method to some thing like;
	@Override
	public Map<String, Object> getWidgetConfiguration() {
		ConceptService cs = Context.getConceptService();
		Map<String, Object> ret = new HashMap<String, Object>();
		ret.put("isNullable", "false");
		ret.put("trueLabel", cs.getConcept(""));
		ret.put("falseLabel", cs.getConcept(getWidgetName()));
		return ret;
	}