!3039 修复:复合实体材质报错

src/DatabaseServices/Entity/CompositeEntity.ts

@@ -237,7 +237,8 @@ export abstract class CompositeEntity extends Entity
                 return;
 
             let o = e.GetDrawObjectFromRenderType(renderType);
-            e.UpdateDrawObjectMaterial(renderType, o);
+            if (o)
+                e.UpdateDrawObjectMaterial(renderType, o);
         });
         this.UpdateDrawObject(renderType, obj);
     }