Update associative.py

lib/fish_eye/associative.py

@@ -223,9 +223,10 @@ class Associate(object):
         print(trks)
         high_matched, unmatched_high_dets, unmatched_trk_ids = associate_detections_to_trackers(high_dets, trks, self.iou_threshold)
 
-        print(trks[unmatched_trk_ids])
+        if len(unmatched_trk_ids) > 0:
+            print(trks[unmatched_trk_ids])
 
-        low_matched, unmatched_low_dets, unmatched_trk_ids = associate_detections_to_trackers(low_dets, trks[unmatched_trk_ids], self.iou_threshold)
+            low_matched, unmatched_low_dets, unmatched_trk_ids = associate_detections_to_trackers(low_dets, trks[unmatched_trk_ids], self.iou_threshold)
 
         # update matched trackers with assigned detections
         for m in high_matched: