docs: private String getParameterValue(CmsObject cms, Map<String, String[]> parameterMap, String key) {
  
          String result = null;
          String[] params = parameterMap.get(key);
          if ((params != null) && (params.length > 0)) {
              result = params[0];
          }
          if (result == null) {
              return "";
          }
          return result;
      }