API Ensure themelist returns an array #612
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Issue silverstripe/.github#328
Fixes https://github.com/silverstripe/silverstripe-subsites/actions/runs/11697085928/job/32899670628
1) SilverStripe\Subsites\Tests\SiteTreeSubsitesTest::testThemeResolverIsUsedForSettingThemeList TypeError: SilverStripe\View\SSViewer::set_themes(): Argument #1 ($themes) must be of type array, null given, called in /home/runner/work/silverstripe-subsites/silverstripe-subsites/src/Extensions/SiteTreeSubsites.php on line 405