Update app.py

app.py

@@ -127,6 +127,7 @@ def invoke(openai_api_key, rag_option, prompt):
         raise gr.Error("Retrieval Augmented Generation is required.")
     if (prompt == ""):
         raise gr.Error("Prompt is required.")
+    completion = ""
     try:
         llm = ChatOpenAI(model_name = config["model"], 
                          openai_api_key = openai_api_key, 
@@ -147,7 +148,6 @@ def invoke(openai_api_key, rag_option, prompt):
             result = llm_chain(llm, prompt)
             completion = result
     except Exception as e:
-        completion = e
         raise gr.Error(e)
     finally:
         wandb_log(prompt, completion, rag_option)