code: public static boolean isNoValueType(Class<?> type) {
  
          LettuceAssert.notNull(type, "Class must not be null!");
  
          return findDescriptor(type).map(Descriptor::isNoValue).orElse(false);
      }
docs: Returns {@literal true} if {@code type} is a reactive wrapper type that contains no value.
  
  @param type must not be {@literal null}.
  @return {@literal true} if {@code type} is a reactive wrapper type that contains no value.