`usort($manifest['versions'] ?? [], ...)` worked in PHP 7 but is a
fatal error in PHP 8 — usort requires its first arg by reference and
the null-coalesce operator produces an rvalue, not a variable. The
existing versions.php didn't trigger it because it sorts
$manifest['versions'] directly. Fixed launcher.php to guard with an
isset/is_array check and only sort when there's actually a versions
array.
Triggered by clicking "Définir" in the new Launcher page → 500 page.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
j.foucher
03483d02e1