Update app.py

app.py

@@ -341,7 +341,8 @@ def bot(history, temperature, top_p, max_output_tokens):
             image_list.append(load_image(f))
         else:
             raise ValueError("Invalid image file")
-
+            
+    image_tensor = []
     if num_new_images > 0:
         image_tensor = [
             our_chatbot.image_processor.preprocess(f, return_tensors="pt")["pixel_values"][