update api key flow

app.py

@@ -18,11 +18,14 @@ openai_api_key = placeholder.text_input(
     placeholder='Your OpenAI API Key'
 )
 
-# Load model
-if openai_api_key != '':
+if openai_api_key == '':
+    st.stop()
+else:
     placeholder.empty()
-    llm = ChatOpenAI(temperature=0, model_name='gpt-3.5-turbo', openai_api_key=openai_api_key)
-    embeddings = OpenAIEmbeddings(openai_api_key=openai_api_key)
+
+# Load model
+llm = ChatOpenAI(temperature=0, model_name='gpt-3.5-turbo', openai_api_key=openai_api_key)
+embeddings = OpenAIEmbeddings(openai_api_key=openai_api_key)
 
 # Load data
 loader = DirectoryLoader('./shakespeare/html/', loader_cls=lambda path: BSHTMLLoader(path, bs_kwargs={'features': 'html.parser'}))