Fix async downloaded browser stubbed module in evaluation phase

Fixes codesandbox#955

Author: Ives van Hoorne

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

@@ -311,8 +311,11 @@ export default async function fetchModule(
   );
 
   if (foundPath === '//empty.js') {
+    // Mark the path of the module as the real module, because during evaluation
+    // we don't have meta to find which modules are browser modules and we still
+    // need to return an empty module for browser modules.
     return {
-      path: '/node_modules/empty/index.js',
+      path: pathUtils.join(currentPath, path),
       code: 'module.exports = {};',
       requires: [],
     };