`rss.js` page error for the author, date and description

### Summary

When I start the react.dev in my local system that time I get this error.

This error comes because of some of the react.dev markdown file doesn't have an author, date, or description. It can be solve using proper error handling.

### Page

https://react.dev/

### Details

When I comment that unhandled area of the code then it run properly.