refactor(App): exit if no message

Author: mikesprague

app/page.tsx

@@ -40,6 +40,10 @@ export const App = () => {
 
   const addMessage = useCallback(
     async (message) => {
+      if (!message) {
+        return;
+      }
+
       await database.messages.put({
         ...message,
         model: parameters.model,