Tutorial command `nx g @nrwl/react:storybook-configuration project-name` fails

Current Behavior

The command from the tutorial at https://nx.dev/storybook/overview-react#generating-storybook-configuration does not work

Expected Behavior

The command should scaffold Storybook for Nx monorepo

Steps to Reproduce

Run npx nx g @nrwl/react:storybook-configuration webapp.

Note: I am migrating an existing CRA app to Nx. First, I used the CRA migration script and now I tried to add Storybook.

This issue may not be prioritized if details are not provided to help us reproduce the issue.

Failure Logs

npx nx g @nrwl/react:storybook-configuration webapp
✔ Configure a cypress e2e app to run against the storybook instance? (Y/n) · false

✔ Automatically generate *.stories.ts files for components declared in this project? (Y/n) · false

✔ Automatically generate *.spec.ts files in the cypress e2e app generated by the cypress-configure generator? (Y/n) · false

adding .storybook folder to the root directory - 
     based on the Storybook version installed (v6), we'll bootstrap a scaffold for that particular version.
adding .storybook folder to app - using Storybook version 6
Cannot read properties of undefined (reading 'map')

Environment

npx nx report                             

 >  NX   Report complete - copy this into the issue template

   Node : 16.14.0
   OS   : darwin x64
   yarn : 1.22.17
   
   nx : 13.8.5
   @nrwl/angular : undefined
   @nrwl/cli : 13.8.5
   @nrwl/cypress : 13.8.5
   @nrwl/detox : undefined
   @nrwl/devkit : 13.8.5
   @nrwl/eslint-plugin-nx : 13.8.4
   @nrwl/express : undefined
   @nrwl/jest : 13.8.5
   @nrwl/js : 13.8.5
   @nrwl/linter : 13.8.5
   @nrwl/nest : undefined
   @nrwl/next : undefined
   @nrwl/node : undefined
   @nrwl/nx-cloud : 13.1.6
   @nrwl/react : 13.8.5
   @nrwl/react-native : undefined
   @nrwl/schematics : undefined
   @nrwl/storybook : 13.8.5
   @nrwl/tao : 13.8.5
   @nrwl/web : 13.8.5
   @nrwl/workspace : 13.8.5
   typescript : 4.6.2
   rxjs : 6.6.7
   ---------------------------------------
   Community plugins:

[mandarini]

Hi there @mdirshaddev ! Thanks for jumping in! I tried it this morning and it looks like it’s working for me. Can you please send me a reproduction repository?

Steps I did:

1. npx create-nx-workspace@latest my-wksp and choose apps
2. yarn add @nrwl/angular@latest @nrwl/react@latest @nrwl/storybook@latest
3. Generate an angular app and a react app
4. nx g @nrwl/angular:storybook-configuration my-app
5. nx g @nrwl/react:storybook-configuration my-other-app

[mrlubos]

Oh! Ha, I just (literally just) added the optional operator to that line, hehehe 😃

That should fix it, thanks!