fix compare node

[Salieri-004]

What type of PR is this?

• [x] bug
• [ ] feature
• [ ] enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

In pr https://github.com/vesoft-inc/nebula/pull/5805, results were the same but the test framework reported an error.

How do you solve it?

In compare_node(lhs, rhs),If lhs.tags == [] and rhs.tags is None, the two tags should be equal.

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:

• [ ] Unit test(positive and negative cases)
• [ ] Function test
• [ ] Performance test
• [ ] N/A

Affects:

• [ ] Documentation affected (Please add the label if documentation needs to be modified.)
• [ ] Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• [ ] If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• [ ] Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....