message: imgproc: fix RemoveOverlaps() with empty input vector
diff: @@ -1355,6 +1355,8 @@ static void GetCircleCenters(const std::vector<int> &centers, std::vector<Vec4f>
  template<typename T>
  static void RemoveOverlaps(std::vector<T>& circles, float minDist)
  {
  + if (circles.size() <= 1u)
  + return;
  float minDist2 = minDist * minDist;
  size_t endIdx = 1;
  for (size_t i = 1; i < circles.size(); ++i)
  