fix(#3567577): UX/PHP/caching issues caused by warning message to content admins (!30) · Merge requests · project / swiper_formatter

Fixes:

* PHP warning because of sometimes `count()` on NULL.
* Despite the permissions check, this patch doesn't set cache contexts, so the warning message was cached and shown to anonymous visitors.
* Content editors were confused by the warning message

fix(#3567577): UX/PHP/caching issues caused by warning message to content admins

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