Fix passing null and array to string conversion error

[sreichel]

Description (*)

Fixes a bug when passing not a full config path to Mage::getStoreConfigFlag(). Also fixes php8.1 passing null to strtolower().

Related Pull Requests

• https://github.com/OpenMage/magento-lts/pull/2586/files#diff-4163393d22b627674a0b85fae62f751335e2c126e28fcb260a2b35708ad6589dL415-R415

Manual testing scenarios (*)

// $test = Mage::getStoreConfigFlag('dev/css/merge_css_files');
$test = Mage::getStoreConfigFlag('dev/css');
var_dump($test);

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[github-actions]

Unit Test Results

1 files  1 suites   0s ⏱️
0 tests 0 ✔️ 0 💤 0 ❌
7 runs  5 ✔️ 2 💤 0 ❌

Results for commit fb71912.