Cookies & Consents Widget: JavaScript error in the customizer in some themes

When using the WordPress Customizer I am getting this error in the Chrome Inspector Tools:

Uncaught TypeError: Cannot read property 'classList' of null
at eu-cookie-law.min.js:2
at eu-cookie-law.min.js:2

It is the Jetpack eu-cookie-law because this is the full source:
https://c0.wp.com/p/jetpack/8.5/_inc/build/widgets/eu-cookie-law/eu-cookie-law.min.js

The offending object is “**n**” which is set to “**getElementById(‘eu-cookie-law’)**”.
I believe there should be a check for existence of the element:

if(n !== null && n.hasOwnProperty('classList'){ ... }

Reproduce the error in the WordPress Customizer with a theme where the eu-cookie-law element is absent, then inspect _inc/build/widgets/eu-cookie-law/eu-cookie-law.min.js from the reported Jetpack source. Confirm that the customizer no longer throws a classList error when getElementById('eu-cookie-law') returns null.

Written by the indexing model from the issue text.