DEV: Handle null theme id in theme site setting cache #33745
Merged
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There are a few legit scenarios where the current
theme ID may be blank, such as safe mode. In this
case it will be better to return default site setting
values rather than to cause random/undefined behaviour
in the UI.
Also clears the theme site setting cache when the
theme ID is null, along with the other fix here this
was probably causing issues in system spec runs