Fix StableWrapperDrawer null reference when no visible children

[quabug]

Summary

• Fix null reference exception in StableWrapperDrawer when GetVisibleChildren() returns no elements
• Use SingleOrDefault() instead of Single() with null checks for graceful handling
• Bump package version to 1.1.2

Test plan

• Open Unity project with StableReference fields
• Verify drawer renders correctly for valid references
• Verify no exceptions when visible children are empty

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @quabug, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical null reference exception within the StableWrapperDrawer component, which previously failed when GetVisibleChildren() yielded an empty result. The core change involves enhancing the drawer's resilience by adopting SingleOrDefault() and incorporating explicit null checks, ensuring the component operates without errors even when no children are visible. This fix improves the stability of the Unity Stable Reference package, and the version has been incremented accordingly.

Highlights

• Null Reference Fix: Resolved a null reference exception in StableWrapperDrawer that occurred when GetVisibleChildren() returned no elements.
• Robust Child Handling: Implemented SingleOrDefault() instead of Single() along with explicit null checks to gracefully handle scenarios where no visible children are present.
• Package Version Bump: The package version has been updated from 1.1.1 to 1.1.2 to reflect this bug fix.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a potential crash in StableWrapperDrawer when a property has no visible children by using SingleOrDefault() and adding null checks. The package version is also appropriately bumped. My review includes a couple of suggestions to improve code clarity and maintainability by avoiding parameter reassignment. Overall, a good fix.