Update app.py

app.py

@@ -37,7 +37,7 @@ def invoke(openai_api_key, youtube_url, process_video, prompt):
         splits = text_splitter.split_documents(docs)
     else:
         print(222)
-        splits = None
+        splits = iter([])
     vector_db = Chroma.from_documents(documents = splits, embedding = OpenAIEmbeddings(), persist_directory = CHROMA_DIR)
     llm = ChatOpenAI(model_name = MODEL_NAME, temperature = 0)
     qa_chain = RetrievalQA.from_chain_type(llm, retriever = vector_db.as_retriever(), return_source_documents = True, chain_type_kwargs = {"prompt": QA_CHAIN_PROMPT})