Update app.py

app.py

@@ -425,7 +425,7 @@ if __name__ == '__main__':
      
         async def upload_handler(files):
 
-            if files.lower().endswith(".pdf") or :
+            if files.lower().endswith(".pdf"):
                 asyncio.create_task(send_pdf_async_aiohttp(files, server_ip=openai_api_base, Authorization=Authorization))
             
             b64s = files_to_b64(files)