message: Prevent empty _Jo matrix multiplication when using calibrateCameraRO with iFixedPoint > 0
diff: @@ -1588,7 +1588,7 @@ static double cvCalibrateCamera2Internal( const CvMat* objectPoints,
  Mat _Je( maxPoints*2, 6, CV_64FC1 );
  Mat _err( maxPoints*2, 1, CV_64FC1 );
  - const bool allocJo = (solver.state == CvLevMarq::CALC_J) || stdDevs;
  + const bool allocJo = (solver.state == CvLevMarq::CALC_J) || stdDevs || releaseObject;
  Mat _Jo = allocJo ? Mat( maxPoints*2, maxPoints*3, CV_64FC1, Scalar(0) ) : Mat();
  if(flags & CALIB_USE_LU) {
  