code: def test_parse_parts_with_multipart_mime_type_and_no_parts(self):
      email_parts = [{"mimeType": "multipart/mixed", "parts": []}]
      attachments = []
      email_body = self.handler._parse_parts(email_parts, attachments)
      expected_body = ""
      expected_attachments = []
      self.assertEqual(email_body, expected_body)
      self.assertEqual(attachments, expected_attachments)
  
imports: from mindsdb.api.executor.data_types.response_type import RESPONSE_TYPE
  from mindsdb.integrations.handlers.gmail_handler.gmail_handler import GmailHandler
  from mindsdb.integrations.handlers.gmail_handler.gmail_handler import EmailsTable
  from google.oauth2.credentials import Credentials
  from mindsdb_sql import parse_sql
  import unittest
  from unittest.mock import Mock, patch
  from unittest import mock
label_desc: Use image node_id 8 for calling the GmailHandlerTest obj's underlying member method code with example usage: obj.test_parse_parts_with_multipart_mime_type_and_no_parts() without return types