made changes in score_window

inference.py

@@ -91,7 +91,10 @@ class SlidingWindowRefiner:
         roi = cv2.resize(roi, self.template.shape[::-1])
         kp, desc = self.sift.detectAndCompute(roi, None)
 
-        if desc is None:
+        if desc is None or len(desc) < 2:
+            return 0
+
+        if len(self.template_desc) < 2:
             return 0
 
         matches = self.flann.knnMatch(self.template_desc, desc, k=2)