fix(manifest): keep scancode licenses when manifest empty

[soimkim]

Summary

• Keep ScanCode licenses when manifest license extraction returns empty ([]), including parse failure, Android.bp, and license-file-only metadata (e.g. pyproject {file=...}).
• Clarify merge comments and add a pyproject.toml regression test.

[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

Manifest license merge

Layer / File(s)	Summary
Recognize setup.cfg license-file references src/fosslight_source/run_manifest_extractor.py, tests/test_manifest_setup_cfg.py	get_licenses_from_setup_cfg now returns no license for LICENSE references, including case variants, while SPDX values such as MIT remain supported.
Preserve ScanCode licenses for empty manifest results src/fosslight_source/cli.py, src/fosslight_source/run_manifest_extractor.py, tests/test_manifest_setup_cfg.py, tests/test_manifest_recommended_scenarios.py	Manifest results with no valid licenses preserve existing ScanCode licenses and still mark the item as a manifest file. Tests cover setup.cfg and pyproject.toml cases.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 1c1ce

The license-preservation change is covered for the new scenario, but an existing package.json regression test is no longer collected because of a duplicate test name. Rename the new test before merging to retain coverage for both manifest formats.

Suggested reviewers: justinwonjaepark

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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 and concisely describes the main change: preserving ScanCode licenses when manifest license extraction returns an empty result.

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✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/manifest-keep-scancode-license

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Actionable comments posted: 1

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Inline comments:
In `@tests/test_manifest_recommended_scenarios.py`:
- Line 39: Rename the duplicate test function
test_scenario2_pyproject_license_file_keeps_scancode_licenses to a unique name
that identifies the pyproject scenario, preserving the test body and ensuring
both the package.json and pyproject regression tests are collected.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1c50dae and 1c1ced8.

📒 Files selected for processing (4)

• src/fosslight_source/cli.py
• src/fosslight_source/run_manifest_extractor.py
• tests/test_manifest_recommended_scenarios.py
• tests/test_manifest_setup_cfg.py

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