Plugin throws an error on pattern editor

[smithjw1]

Describe the bug
When you load the site editor to create a pattern, you see an error: The "vip-workflow-custom-status" plugin has encountered an error and cannot be rendered.

In the console, this error is thrown:

react-dom.min.js?ver=18.3.1:2 TypeError: Cannot read properties of null (reading 'classList')
    at custom-status-block.js?ver=8ef85e6883db7d21ec7a:1

Looks like this useEffect is to blame.

To Reproduce

• Activate the plugin
• Load a pattern in the site editor

Expected behavior
When not in the Post Editor context, custom statuses are ignored.

Actual behavior
An error

Version of the plugin
trunk (github checkout)