message: interactive-calibration: use empty() method instead of checking dimension size
diff: @@ -395,7 +395,8 @@ ShowProcessor::ShowProcessor(cv::Ptr<calibrationData> data, cv::Ptr<calibControl
  cv::Mat ShowProcessor::processFrame(const cv::Mat &frame)
  {
  - if(mCalibdata->cameraMatrix.size[0] && mCalibdata->distCoeffs.size[0]) {
  + if (!mCalibdata->cameraMatrix.empty() && !mCalibdata->distCoeffs.empty())
  + {
  mTextSize = VIDEO_TEXT_SIZE * (double) frame.cols / IMAGE_MAX_WIDTH;
  cv::Scalar textColor = cv::Scalar(0,0,255);
  cv::Mat frameCopy;
  