fix: ensure we can deploy code when there is no pre or post-deploy script defined

Closes #3385

tests/apps/nodejs-express-noappjson/worker.js

@@ -0,0 +1,6 @@
+function worker() {
+  console.log('sleeping for 60 seconds');
+  setTimeout(worker, 60 * 1000);
+}
+
+worker();