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Update System.php
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@ -526,7 +526,7 @@ class System
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*
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* @return boolean the directory is usable
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*/
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private static function isDirectoryUsable($directory): bool
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private static function isDirectoryUsable(string $directory): bool
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{
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if (empty($directory)) {
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Logger::warning('Directory is empty. This shouldn\'t happen.');
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