realpath() cannot take NULL but NULL expected for metapackages

So, I think the fix is (line 320): $path = realpath($package['path']);

becomes: $path = realpath($package['path'] ?? '');

UPDATE: Meh, no that doesn't work because it resolves to the "web" folder and not the composer root.

$path = realpath($package['path'] ?? $working_dir); might do it, but doesn't feel quite right.

Dupe of https://www.drupal.org/project/automatic_updates/issues/3363259 📌 Compatibility with Composer 2.5.7 Fixed