Fix NPE in parseChunk()

[LonelyMidoriya]

Summary by CodeRabbit

• Bug Fixes
  • Improved content stream handling when artifact data is unavailable or represented in an unexpected format.
  • Prevented validation issues caused by missing artifact lists.
  • Preserved existing behavior for PDF form artifact processing and error recovery.

[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: eb81b3ed-9694-4279-914f-fb4cae814d6d

📥 Commits

Reviewing files that changed from the base of the PR and between 60dbfde and 74013eb.

📒 Files selected for processing (2)

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

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📝 Walkthrough

Walkthrough

GFSAContentStream now uses an empty artifact list for unsupported content stream object types. ChunkParser has a formatting-only indentation change.

Changes

Artifact parsing

Layer / File(s)	Summary
Handle content stream artifacts wcag-validation/src/main/java/org/verapdf/gf/model/impl/sa/GFSAContentStream.java, wcag-validation/src/main/java/org/verapdf/gf/model/factory/chunks/ChunkParser.java	Unsupported content stream objects now produce an empty artifact list. The Form XObject artifact merge statement is reindented without a behavior change.

Estimated code review effort: 1 (Trivial) | ~3 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 identifies the primary change: fixing a null pointer exception 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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