Description

If a post type has no title support, then ref.current is undefined and there is no ownerDocument to read nor title to focus. See #29921

How has this been tested?

1. Register a post type with no title support
2. Add a new post of that post type
3. Attempt to switch to code editor view

1. Register a post type with title support
2. Add a new post of that post type
3. Attempt to switch to code editor view

Types of changes

Bug fix, see #29921.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.