Core: redirect to toolbar creation if user tries to add function when there is nothing in Tree

Signed-off-by: Yash Suthar <yashsuthar983@gmail.com>

src/Gui/Dialogs/DlgToolbarsImp.cpp

@@ -302,6 +302,9 @@ void DlgCustomToolbars::onMoveActionRightButtonClicked()
 {
     QTreeWidgetItem* item = ui->commandTreeWidget->currentItem();
     if (item) {
+        if (!ui->toolbarTreeWidget->topLevelItemCount()) {
+            onNewButtonClicked();
+        }
         QTreeWidgetItem* current = ui->toolbarTreeWidget->currentItem();
         if (!current) {
             current = ui->toolbarTreeWidget->topLevelItem(0);