tuning

docs/api.adoc

@@ -308,7 +308,6 @@ The response should now contain a new age filed, with a calculated value:
 }
 ----
 
-
 As you have now seen, XP lets you run server-side https://developer.enonic.com/docs/xp/stable/framework[TypeScript and JavaScript code]. API augmentation is just the tip of the iceberg - believe us.
 
 == One last thing

samples/guillotine/guillotine.ts

@@ -22,7 +22,7 @@ export const extensions = (graphQL) => {
           }
 
           // Calculate age
-          let age = null;
+          let age = 0;
           const today = new Date();
           const birthDate = new Date(env.source.dateofbirth);
           age = today.getFullYear() - birthDate.getFullYear();