message: ts: move message about misused 'optional' under the configuration parameter
diff: @@ -1008,10 +1008,10 @@ static std::string findData(const std::string& relative_path, bool required, boo
  CHECK_FILE_WITH_PREFIX(prefix, result_);
  if (!required && !result_.empty())
  {
  - std::cout << "TEST ERROR: Don't use 'optional' findData() for " << relative_path << std::endl;
  static bool checkOptionalFlag = cv::utils::getConfigurationParameterBool("OPENCV_TEST_CHECK_OPTIONAL_DATA", false);
  if (checkOptionalFlag)
  {
  + std::cout << "TEST ERROR: Don't use 'optional' findData() for " << relative_path << std::endl;
  CV_Assert(required || result_.empty());
  }
  }
  