invalid api flow

app.py

@@ -69,7 +69,8 @@ class ChatWrapper:
             output = chain.predict(input=inp)
             history.append((inp, output))
         except Exception as e:
-            raise e
+            history.append((inp, "Invalid API key, Please paste Valid API key to use ZolBot Agent")) 
+            return history, history
         finally:
             self.lock.release()
         return history, history