ENGCOM-7236: fix: prevent undefined index error - closes #26762 #26763

 - Merge Pull Request #26763 from DanielRuf/magento2:fix/26762-check-driver-option-exists
 - Merged commits:
   1. 1914636

setup/src/Magento/Setup/Model/ConfigOptionsList/DriverOptions.php

@@ -46,6 +46,6 @@ public function getDriverOptions(array $options): array
      */
     private function optionExists($options, $driverOptionKey): bool
     {
-        return $options[$driverOptionKey] === false || !empty($options[$driverOptionKey]);
+        return isset($options[$driverOptionKey]) && ($options[$driverOptionKey] === false || !empty($options[$driverOptionKey]));
     }
 }