Update app.py

app.py

@@ -79,8 +79,10 @@ class WarehouseStitcher:
         else:
             detector = cv2.AKAZE_create()
         
+        # keypoints, descriptors = detector.detectAndCompute(gray, None)
         keypoints, descriptors = detector.detectAndCompute(gray, None)
-        
+        keypoints = list(keypoints) if keypoints is not None else []
+
         # Add rack label keypoints
         if self.config['detect_rack_labels']:
             labels = self.detect_rack_labels(gray)