Fix OOB access on zero-submesh entities in scene export

[fernandotonon]

Summary

• Fix 2 BLOCKER SonarCloud issues (cpp:S3519): out-of-bounds access when new aiMesh*[0] creates a zero-length array

Changes

Guard mesh array allocation in both buildAiScene (single-entity) and buildSceneAiScene (multi-entity) to use nullptr when the submesh count is zero. The inner iteration loops are already guarded by si < numSub, so with nullptr instead of a zero-length allocation, there is no undefined behavior.

Test plan

• All 32 MeshImporterExporter tests pass
• SonarCloud analysis on this PR should clear the 2 BLOCKER issues

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes

  • Prevented invalid allocations when meshes are absent, improving stability and avoiding potential runtime issues.

• New Features

  • Added Snap Store installation option and clarified Linux installation flow with optional .deb alternative.

• Chores

  • Project version updated to 2.14.2 and README/docs updated with install badges and formatting tweaks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9db3abb6-ce1e-4167-ad16-6cd53fb61748

📥 Commits

Reviewing files that changed from the base of the PR and between b6b7335 and 346ec15.

📒 Files selected for processing (4)

• CMakeLists.txt
• README.md
• docs/index.html
• src/MeshImporterExporter.cpp

🚧 Files skipped from review as they are similar to previous changes (1)

• src/MeshImporterExporter.cpp

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📝 Walkthrough

Walkthrough

Replaces unconditional aiMesh* array allocations with conditional allocations that use nullptr when mesh counts are zero; updates project version and installation docs (Snap/.deb) and adds a Snap Store badge to README.

Changes

Cohort / File(s)	Summary
Core source src/MeshImporterExporter.cpp	Guarded aiMesh* array allocations in buildAiScene/buildSceneAiScene to avoid zero-sized allocations; allocation now happens only when mesh count > 0, otherwise set to nullptr.
Build metadata CMakeLists.txt	Bumped project VERSION from 2.14.1 to 2.14.2.
Documentation / Website README.md, docs/index.html	Added Snap Store badge and Snap install instructions; reworked Linux installation section to recommend Snap and also show .deb alternative; adjusted headings and removal commands.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• Fix scene save freeze and non-PNG texture export #195: Modifies buildAiScene and related scene construction in src/MeshImporterExporter.cpp, touching the same allocation/code paths.

Poem

🐰 A rabbit hops through memory lanes,
Where zero meshes caused some pains,
Guards now stand where gaps would be,
nullptrs keep the heap tidy and free,
Hooray for checks and softer gains.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and accurately summarizes the main fix: preventing out-of-bounds access when zero-submesh entities are exported.
Description check	✅ Passed	The description covers the template structure with a summary of the fix and technical details, though it deviates from the template's section headings and lacks explicit feature/bugfix categorization.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/sonar-oob-mesh-array

📝 Coding Plan

• Generate coding plan for human review comments

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
40.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud