Fix NPE in getobjectKey()

[LonelyMidoriya]

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of PDF objects without an object key, preventing errors when accessing their metadata.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: bec4b81a-4631-4af6-a19e-e79187a7ef42

📥 Commits

Reviewing files that changed from the base of the PR and between c9d6024 and e0b477a.

📒 Files selected for processing (1)

• validation-model/src/main/java/org/verapdf/gf/model/impl/pd/GFPDObject.java

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📝 Walkthrough

Walkthrough

getobjectKey() now returns null when the underlying COS object has no object key. This prevents dereferencing a missing key.

Changes

Object key access

Layer / File(s)	Summary
Null-safe object key retrieval validation-model/src/main/java/org/verapdf/gf/model/impl/pd/GFPDObject.java	getobjectKey() checks for a missing COS object key before converting it to a string.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: maximplusov

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing a null-pointer exception in getobjectKey().
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.

✨ Finishing Touches

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch npe

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