Verify null material handling in Renderer.sharedMaterials access

[Copilot]

Unity's Renderer.sharedMaterials can contain null entries when materials are missing. The issue reported reference errors in Quick Variant list display and material application, requesting fixes across the codebase.

Analysis Results

All sharedMaterials access points already implement proper null filtering:

QuickVariantWindow.cs

• GetMaterials(): Filters nulls after concatenating all material sources (line 224: .Where(m => m != null))
• OnClickCreateMaterials(): Explicit null check when applying materials (lines 175-178)

MaterialReplacerWindow.cs

• GetRendererMaterials(): Filters nulls immediately (line 31: .Where(m => m != null))
• OnClickApply(): Explicit null check when applying materials (lines 158-160)

MaterialReplacerRuleEditor.cs

• GetMaterials(): Filters nulls before return (line 69: .Where(m => m != null))

No code changes required. The base commit already contains comprehensive null handling for all identified scenarios.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Renderer.sharedMaterials等にnullのマテリアルが含まれていると参照エラーになる問題の修正</issue_title>
<issue_description>Quick Variantの一覧表示とマテリアル適用で発生を確認した。他にもあれば合わせて修正すること。</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Renderer.sharedMaterials等にnullのマテリアルが含まれていると参照エラーになる問題の修正 #1

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