fix(registry): guard against nil logger in RelationshipCSVHelper

[Omkar-Ugal]

Description
This fixes a nil pointer panic in RelationshipCSVHelper.ParseRelationshipsSheet() when Log is not initialized.

Signed commits

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Summary by CodeRabbit

• Bug Fixes
  • Improved relationship parsing stability when logging is unavailable.
  • Parsing errors continue to be returned correctly without causing additional failures.

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📝 Walkthrough

Walkthrough

Relationship parsing now guards informational and error logging with nil checks. Parsing errors remain returned to the caller.

Changes

Relationship parsing

Layer / File(s)	Summary
Guard relationship parsing logs registry/relationship.go	The parser logs informational messages and parsing errors only when Log is initialized. Parsing errors remain returned.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: codeahmedjamil

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the nil logger guard added to RelationshipCSVHelper, which matches the main change.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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