message: Update circlesgrid.cpp
  Use identity matrix if homography finding failed. Current behavior zeros out all points.
  Update circlesgrid.cpp
  Addressed comments
  Update circlesgrid.cpp
  removed whitespace
diff: @@ -839,7 +839,11 @@ Mat CirclesGridFinder::rectifyGrid(Size detectedGridSize, const std::vector<Poin
  //Mat H = findHomography( Mat( corners ), Mat( dstPoints ) );
  if (H.empty())
  + {
  H = Mat::zeros(3, 3, CV_64FC1);
  + warpedKeypoints.clear();
  + return H;
  + }
  std::vector<Point2f> srcKeypoints;
  for (size_t i = 0; i < keypoints.size(); i++)
  