Fix boundary problems

deploy/cpp_infer/src/utility.cpp

@@ -268,13 +268,14 @@ cv::Mat Utility::crop_image(cv::Mat &img, std::vector<int> &area) {
 
 void Utility::sorted_boxes(std::vector<OCRPredictResult> &ocr_result) {
   std::sort(ocr_result.begin(), ocr_result.end(), Utility::comparison_box);
-
+  if (ocr_result.size() > 0) {
     for (int i = 0; i < ocr_result.size() - 1; i++) {
       if (abs(ocr_result[i + 1].box[0][1] - ocr_result[i].box[0][1]) < 10 &&
           (ocr_result[i + 1].box[0][0] < ocr_result[i].box[0][0])) {
         std::swap(ocr_result[i], ocr_result[i + 1]);
       }
     }
+  }
 }
 
 } // namespace PaddleOCR
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