Feat: Alter flask to Quart for async API serving. (#11275)

### What problem does this PR solve?

#11277

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

agent/component/message.py

@@ -17,7 +17,6 @@ import json
 import os
 import random
 import re
-import pypandoc
 import logging
 import tempfile
 from functools import partial
@@ -30,6 +29,7 @@ from common.connection_utils import timeout
 from common.misc_utils import get_uuid
 from common import settings
 
+
 class MessageParam(ComponentParamBase):
     """
     Define the Message component parameters.
@@ -176,6 +176,10 @@ class Message(ComponentBase):
         return ""
 
     def _convert_content(self, content):
+        if not self._param.output_format:
+            return
+
+        import pypandoc
         doc_id = get_uuid()
         
         if self._param.output_format.lower() not in {"markdown", "html", "pdf", "docx"}: