Issue #3580885: PHP 8.5 deprecation: Using null as array offset in LanguageSwitcherLinksAlterer::alter()

Tadej Bašarequested to merge
issue/facets-3580885:3580885-php-8-5-null-array-offset-languageswitcher into 2.0.x

Issue #3580885: PHP 8.5 deprecation: Using null as array offset in LanguageSwitcherLinksAlterer::alter()

Closes #3580885

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