refactor: use optional chaining for improved readability and maintained functionality

apps/generator/lib/generator.js

@@ -130,15 +130,16 @@ class Generator {
     /** @type {Object} The template parameters. The structure for this object is based on each individual template. */
     this.templateParams = {};
     Object.keys(templateParams).forEach(key => {
-      const self = this;
       Object.defineProperty(this.templateParams, key, {
         enumerable: true,
-        get() {
-          if (!self.templateConfig.parameters || !self.templateConfig.parameters[key]) {
-            throw new Error(`Template parameter "${key}" has not been defined in the package.json file under generator property. Please make sure it's listed there before you use it in your template.`);
+        get: () => {
+          if (this.templateConfig.parameters?.[key] == null) {
+            throw new Error(
+              `Template parameter "${key}" has not been defined in the package.json file under generator property. Please make sure it's listed there before you use it in your template.`
+            );
           }
           return templateParams[key];
-        }
+        },
       });
     });
   }