fix: fix timezone not supporting Windows

[qevolg]

Description

Fix timezone not supporting Windows

Fix: https://project.feishu.cn/taosdata_td/defect/detail/6494389715

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

Summary of Changes

Hello @qevolg, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a bug related to timezone support on Windows by modifying how the timezone connection option is handled. The change removes an unnecessary explicit setting of a 'null' timezone, which was causing issues. By simplifying this logic, the PR aims to improve the robustness and compatibility of timezone settings, particularly for Windows environments.

Highlights

• Timezone Handling Refinement: The logic for setting the connection timezone has been refined by removing an 'else' block. Previously, if no specific timezone was provided, the system would explicitly set the timezone option to 'null'. This change ensures that the timezone option is only set when a valid timezone is provided, preventing potential issues with 'null' interpretation, especially on Windows.

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[gemini-code-assist]

Code Review

This pull request addresses an issue with timezone handling on Windows. The change removes the logic that explicitly sets the timezone to null when no timezone is provided in the configuration. This was reportedly causing issues on Windows environments. By removing this else block, the code will now simply not set a timezone if one isn't specified, allowing the system to fall back to the server's default timezone. This is a sensible fix that directly addresses the described problem. The change is correct and well-contained.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.58%. Comparing base (340a437) to head (1f7ae2a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   80.59%   80.58%   -0.01%     
==========================================
  Files          30       30              
  Lines        2422     2421       -1     
  Branches      415      415              
==========================================
- Hits         1952     1951       -1     
  Misses        364      364              
  Partials      106      106              

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