Fix crash when cliking within embedded layer dialog, before a project

is selected

Fixes #19369

src/app/qgsprojectlayergroupdialog.cpp

@@ -48,6 +48,9 @@ QgsProjectLayerGroupDialog::QgsProjectLayerGroupDialog( QWidget *parent, const Q
 {
   setupUi( this );
 
+  QgsEmbeddedLayerTreeModel *model = new QgsEmbeddedLayerTreeModel( mRootGroup, this );
+  mTreeView->setModel( model );
+
   QgsSettings settings;
 
   mProjectFileWidget->setStorageMode( QgsFileWidget::GetFile );
@@ -185,9 +188,6 @@ void QgsProjectLayerGroupDialog::changeProjectFile()
   if ( !mShowEmbeddedContent )
     removeEmbeddedNodes( mRootGroup );
 
-  QgsEmbeddedLayerTreeModel *model = new QgsEmbeddedLayerTreeModel( mRootGroup, this );
-  mTreeView->setModel( model );
-
   connect( mTreeView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsProjectLayerGroupDialog::onTreeViewSelectionChanged );
 
   mProjectPath = mProjectFileWidget->filePath();