message: handle empty cameraMatrix
diff: @@ -417,7 +417,7 @@ int main(int argc, char* argv[])
  // -----------------------Show the undistorted image for the image list ------------------------
  //! [show_results]
  - if( s.inputType == Settings::IMAGE_LIST && s.showUndistorsed )
  + if( s.inputType == Settings::IMAGE_LIST && s.showUndistorsed && !cameraMatrix.empty())
  {
  Mat view, rview, map1, map2;
  