fix nit

app.py

@@ -378,7 +378,7 @@ def on_image_click(
     inference_session = state.inference_session
     original_size = None
     pixel_values = None
-    if not inference_session.processed_frames or frame_idx not in inference_session.processed_frames:
+    if inference_session.processed_frames is None or frame_idx not in inference_session.processed_frames:
         inputs = processor(images=state.video_frames[frame_idx], device=state.device, return_tensors="pt")
         original_size = inputs.original_sizes[0]
         pixel_values = inputs.pixel_values[0]
@@ -499,7 +499,7 @@ def propagate_masks(GLOBAL_STATE: gr.State):
     with torch.inference_mode():
         for frame_idx, frame in enumerate(GLOBAL_STATE.video_frames):
             pixel_values = None
-            if not inference_session.processed_frames or frame_idx not in inference_session.processed_frames:
+            if inference_session.processed_frames is None or frame_idx not in inference_session.processed_frames:
                 pixel_values = processor(images=frame, device="cuda", return_tensors="pt").pixel_values[0]
             sam2_video_output = model(inference_session=inference_session, frame=pixel_values, frame_idx=frame_idx)
             H = inference_session.video_height