All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This PR fixes a Uncaught TypeError:

Uncaught TypeError: Cannot read properties of undefined (reading 'innerHTML')
    at getTinyMceValue (product-tour.js?ver=6.7.0:93:220)

It seems that #tinymce is loaded after we call getTinyMceValue. This only happens

• when a user uses the text editor by default
• the first time that a user switches editor to TinyMce

I think a way to fix it is to use MutationObserver, but I don't think it's worth it. So just check the type and return an empty string if it's undefined.

I also changed all document.querySelector... as ...; to document.querySelector<...> to avoid null exceptions.

How to test the changes in this Pull Request:

1. Install and activate WCA Test Helper
2. Go to Tools > WCA Test Helper > Features
3. Enable experimental-product-tour
4. Go to Tools > WCA Test Helper > Experiments
5. Add woocommerce_products_tour to treatment
6. Go to WooCommerce > Home > Add my products > Start with a template > Physical product
7. Observe that spotlight tour is displayed and dismiss it.
8. Switch to the text tab for product description
9. Reload the page
10. Observe that spotlight tour is displayed again
11. Click "next" button
12. Switch to the Visual tab
13. Observe that the spotlight tour is still shown and no typeError in dev tools.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you created a changelog file for each project being changed, ie pnpm changelog add --filter=<project>?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.