code: protected static boolean assertFalse(String string) {
          return string == null
              || StringUtils.EMPTY.equals(string)
              || StringUtils.FALSE.equalsIgnoreCase(string)
              || StringUtils.NULL.equals(string);
      }
docs: 判断字符串是否为空或"false"或"null"
  
  @param string 字符串
  @return 是否为空或"false"或"null"