fix: chat history might be empty in log detail view

[xuzuodong]

Summary

Screenshots

Before:	After:

How did this happen?

When the fetched message list (10 items) is partial, and in the fetched list, there are more than one messages whose parent_message_id are temporarily unknown, the view will not display any records.

See message tree diagram below: the 93156a node is not yet fetched from backend, and there are multiple messages depend on it.

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods