Update app.py

app.py

@@ -252,7 +252,7 @@ async def image_search_pinecone(
 
                 return {"similar_images": similar_images}
 
-        elif action == "index" and len(images_to_search) > 0:
+        elif action == "index" and (images_to_search is not None) and (len(images_to_search) > 0):
             print(
                 f"Recived images of length: {len(images_to_search)} needs to retrieve top k  : {top_k} similar images as result"
             )