Fix NPE in parseChunk()

[LonelyMidoriya]

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of PDF form artifacts when no artifact list is available.
  • Prevented validation failures caused by missing artifact data.

[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: 5203dbd5-5f9d-4e3a-a903-31dadfc015a4

📥 Commits

Reviewing files that changed from the base of the PR and between 4dea032 and 60dbfde.

📒 Files selected for processing (1)

• wcag-validation/src/main/java/org/verapdf/gf/model/factory/chunks/ChunkParser.java

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📝 Walkthrough

Walkthrough

Changes

Form artifact handling

Layer / File(s)	Summary
Guard form artifact merging wcag-validation/src/main/java/org/verapdf/gf/model/factory/chunks/ChunkParser.java	Form XObject artifacts are merged only when xForm.getArtifacts() returns a non-null list.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: maximplusov, vladimir-burshnev

🚥 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 describes the main change: preventing a null-related failure in parseChunk().
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

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch npe-chunk-parser

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