Merge pull request #381 from SatorImaging/improve-prefab-retrieve-method

Add non-string based method to search prefab

Assets/VRM/UniVRM/Editor/BlendShape/PreviewEditor.cs

@@ -95,6 +95,12 @@ namespace VRM
             }
 
             var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(assetPath);
+            // search prefab if nothing
+            if (prefab == null && 0 < (target as BlendShapeAvatar).Clips.Count)
+            {
+                prefab = (target as BlendShapeAvatar).Clips[0].Prefab;
+            }
+            // once more, with string-based method
             if (prefab == null)
             {
                 var parent = UniGLTF.UnityPath.FromUnityPath(assetPath).Parent;