Fix crash in ~EditorSpatialGizmoPlugin when generating documentation data

editor/plugins/spatial_editor_plugin.cpp

@@ -4062,7 +4062,6 @@ void _update_all_gizmos(Node *p_node) {
 
 void SpatialEditor::update_all_gizmos(Node *p_node) {
 	if (!p_node) {
-		if (!SceneTree::get_singleton()) return;
 		p_node = SceneTree::get_singleton()->get_root();
 	}
 	_update_all_gizmos(p_node);
@@ -6269,5 +6268,7 @@ EditorSpatialGizmoPlugin::~EditorSpatialGizmoPlugin() {
 		current_gizmos[i]->set_plugin(NULL);
 		current_gizmos[i]->get_spatial_node()->set_gizmo(NULL);
 	}
-	SpatialEditor::get_singleton()->update_all_gizmos();
+	if (SpatialEditor::get_singleton()) {
+		SpatialEditor::get_singleton()->update_all_gizmos();
+	}
 }