Merge pull request '씬, 라이팅 수정' (#143) from njh/250529_00 into main

Reviewed-on: http://220.90.135.190:3000/UVCXR/Studio/pulls/143

Assets/Scripts/Studio/DataStructures/CustomAssetData.cs

@@ -110,6 +110,8 @@ namespace Studio.Util
                 for (int k = 0; k < renderer.sharedMaterials.Length; k++)
                 {
                     Material mat = renderer.sharedMaterials[k];
+                    if (mat == null)
+                        continue;
                     if (mat.name.EndsWith("_alpha"))
                     { 
                         string baseMaterialName = mat.name.Replace("_alpha", "");