修复:在布局中隐藏图框,一键打印时崩溃

src/Add-on/Print.ts

@@ -941,7 +941,12 @@ export async function GetImgElement(ens: Entity[], isReset = true)
     {
         if (e instanceof ViewportEntity)
         {
+            if (!e.Visible) continue;
+
             let o = e.DrawObject;
+            if (!o.children.length)
+                continue;
+
             (o.children[0].children[0] as Line).material = ColorMaterial.TransparentLineMaterial;
             app.Viewer.Scene.add(o);
         }