ENGCOM-5999: Correctly check if the type is undefined #24852

 - Merge Pull Request #24852 from DanielRuf/magento2:fix/typeof-undefined-check
 - Merged commits:
   1. 04f4b88

Author: magento-engcom-team

lib/web/mage/decorate.js

@@ -25,7 +25,7 @@
                     items;
 
                 if (list.length > 0) {
-                    items = typeof isRecursive === undefined || isRecursive ?
+                    items = typeof isRecursive === 'undefined' || isRecursive ?
                         list.find('li') :
                         list.children();
                     items.decorate('generic', ['odd', 'even', 'last']);