Ensure Debugger renders without error (#6423)

panel/models/terminal.ts

@@ -113,7 +113,9 @@ export class TerminalView extends HTMLBoxView {
 
   override after_layout(): void {
     super.after_layout()
-    this.fit()
+    if (this.container != null) {
+      this.fit()
+    }
   }
 }
 

panel/tests/ui/widgets/test_debugger.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+import pytest
+
+from panel.tests.util import serve_component
+from panel.widgets import Debugger
+
+pytest.importorskip("playwright")
+
+pytestmark = pytest.mark.ui
+
+
+def test_tabulator_no_console_error(page):
+    widget = Debugger()
+
+    msgs, _ = serve_component(page, widget)
+
+    page.wait_for_timeout(1000)
+
+    assert [msg for msg in msgs if msg.type == 'error' and 'favicon' not in msg.location['url']] == []