Fix flaky integration test for empty query handling

Goal: Fix the intermittent test failure in messageFlows.test.js where "Expected done to be called once, but it was called multiple times."

Problem: The integration test for empty query handling has a race condition that causes it to fail randomly. This indicates improper cleanup or multiple event handlers being triggered.

Solution:

• Review the test cleanup logic in __tests__/integration/messageFlows.test.js
• Ensure proper connection teardown and event handler cleanup
• Add proper synchronization to prevent multiple done() calls