Removed emptiness check from cv::hconcat and cv::vconcat. Sometimes you want to concatenate with an empty matrix.
Removed emptiness check from cv::hconcat and cv::vconcat. Sometimes you want to concatenate with an empty matrix.

opencv/opencv,apavlenko/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,apavlenko/opencv,opencv/opencv,opencv/opencv