bugfix undefined element.logic

js/erp5_loader.js

@@ -6436,7 +6436,7 @@
       if (spec.children) {
         for (i = 0; i < spec.children.length; i += 1) {
           element = spec.children[i];
-          param = element.logic.setParam;
+          param = element.logic ? element.logic.setParam : undefined;
 
           // reference to parent gadget
           if (spec.reference) {