[FIX] sale_product_configurator: fix read properties error of undefined

If sales, inventory, project and renting are installed and product
configurator is enabled, when user adds one storable product and
confirms the order and adds one service product after the traceback
appears caused by reading properties of undefined variable parentList.

opw-3324320

closes odoo/odoo#131210

Signed-off-by: Valeriya Chuprina (vchu) <vchu@odoo.com>

addons/sale_product_configurator/static/src/js/product_configurator_widget.js

@@ -96,7 +96,7 @@ ProductConfiguratorWidget.include({
         var self = this;
         this._super.apply(this, arguments);
         var parentList = self.getParent();
-        var unselectRow = (parentList.unselectRow || function() {}).bind(parentList); // form view on mobile
+        var unselectRow = (parentList && parentList.unselectRow || function() {}).bind(parentList); // form view on mobile
         if (self.optionalProducts && self.optionalProducts.length !== 0) {
             self.trigger_up('add_record', {
                 context: self._productsToRecords(self.optionalProducts),