[sc-29652] Skip SystemDescription if comment is empty string

[usefulalgorithm]

🤔 Why?

A SystemDescription with empty string as description Metaphor ingestion, we should only populate it if the comment is a non-empty string.

🤓 What?

As titled.

🧪 Tested?

Tested against our stage environment.

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
13402	11969	89%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/unity_catalog/extractor.py	95%	🟢
TOTAL	95%	🟢

updated for commit: 4ecc3a4 by action🐍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@6e6bb7f). Learn more about missing BASE report.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1029   +/-   ##
=======================================
  Coverage        ?   89.30%           
=======================================
  Files           ?      205           
  Lines           ?    13402           
  Branches        ?        0           
=======================================
  Hits            ?    11969           
  Misses          ?     1433           
  Partials        ?        0           

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