Update app.py

app.py

@@ -382,8 +382,8 @@ def draw_mask(l, c, k, v, d, evt: gr.EventData):
     delta = 0
     ddepth = cv2.CV_16S
 
-    if edge == [] or params["fnum"] != frame_selected or params["l"] != l or params["c"] != c or params["k"] != k:
-      if edge != []:
+    if len(edge) == 0 or params["fnum"] != frame_selected or params["l"] != l or params["c"] != c or params["k"] != k:
+      if len(edge) > 0:
           d["background"] = cv2.imread(masks[frame_selected]).astype(np.uint8)
 
       bg = cv2.cvtColor(d["background"], cv2.COLOR_RGBA2GRAY)