Non-Existent Changeset UUID Fix

For WordPress installations that run into the error “Non-Existent┬áChangeset UUID” when previewing Appearance -> Customisation, the solution is quite simple.   There are two possible causes: 1. It is┬ácaused by HSTS (HTTP Strict Transport Security) with subdomains such as WWW turned on and having two seperate URLs for SITEURL and …