ENGCOM-1491: [Backport] Fix infinite checkout loader on a script error #15091

 - Merge Pull Request #15091 from rogyar/magento2:2.1-checkout-loader-fix
 - Merged commits:
   1. 78a2e51

Author: magento-engcom-team

lib/web/mage/requirejs/resolver.js

@@ -27,14 +27,28 @@ define([
         return !!_.findWhere(callbacks, callback);
     }
 
+    /**
+     * Checks if provided module is rejected during load.
+     *
+     * @param {Object} module - Module to be checked.
+     * @return {Boolean}
+     */
+    function isRejected(module) {
+        return registry[module.id] && registry[module.id].error;
+    }
+
     /**
      * Checks if provided module has unresolved dependencies.
      *
      * @param {Object} module - Module to be checked.
      * @returns {Boolean}
      */
     function isPending(module) {
-        return !!module.depCount;
+        if (!module.depCount) {
+            return false;
+        }
+
+        return module.depCount > _.filter(module.depMaps, isRejected).length;
     }
 
     /**