Fix email form server check and return error code if existing

src/routes/api/newsletter/+server.ts

@@ -18,9 +18,9 @@ export const POST: RequestHandler = async ({ request }) => {
             })
             const res = await req.json()
 
-            if (res && res.email_address && res.status === 'PENDING') {
+            if (res) {
                 return new Response(JSON.stringify({
-                    code: 'PENDING'
+                    code: res.error ? res.error.code : res.status
                 }))
             }
         }