Update app.py

app.py

@@ -51,10 +51,14 @@ def main():
 
 
     # Initialize Groq Langchain chat object and conversation
-    groq_chat = ChatGroq(
-            groq_api_key=groq_api_key, 
-            model_name=model
-    )
+    if groq_api_key:
+        groq_chat = ChatGroq(
+                groq_api_key=groq_api_key, 
+                model_name=model
+        )
+    else:
+        st.text_input("Please enter your Groq API key")
+        
 
     conversation = ConversationChain(
             llm=groq_chat,