Update app.py

app.py

@@ -239,7 +239,8 @@ def create_cam_visualization_pil(image_pil, cam, alpha=0.6, vis_threshold=0.2):
     Returns:
         PIL.Image.Image with overlay
     """
-
+    if cam is None:
+        return image_pil
     w, h = image_pil.size
 
     # Resize CAM to match image