Fix untranspiled empty.js

Author: Ives van Hoorne

packages/app/src/sandbox/eval/npm/fetch-npm-module.js

@@ -313,7 +313,7 @@ export default async function fetchModule(
 
   if (foundPath === '//empty.js') {
     return {
-      path: '//empty.js',
+      path: '/node_modules/empty/index.js',
       code: 'module.exports = {};',
       requires: [],
     };

packages/app/src/sandbox/eval/transpiled-module.js

@@ -633,6 +633,9 @@ export default class TranspiledModule {
 
   evaluate(manager: Manager, { asUMD = false }: { asUMD: boolean } = {}) {
     if (this.source == null) {
+      if (this.module.path === '/node_modules/empty/index.js') {
+        return {};
+      }
       // This scenario only happens when we are in an inconsistent state, the quickest way to solve
       // this state is to just hard reload everything.
       manager.clearCache();