Validate Directory resource in xPDOCacheManager->deleteTree() (#255)

Author: opengeek

src/xPDO/Cache/xPDOCacheManager.php

@@ -482,6 +482,9 @@ public function deleteTree($dirname, $options= array('deleteTop' => false, 'skip
                         $handle= opendir($dirname);
                     }
                     $hasMore= false;
+                    if (!is_resource($handle)) {
+                        continue;
+                    }
                     while (false !== ($file= @ readdir($handle))) {
                         if (is_array($excludeItems) && !empty($excludeItems) && in_array($file, $excludeItems)) continue;
                         if (is_array($excludePatterns) && !empty($excludePatterns) && $this->matches($file, $excludePatterns)) continue;