Merge pull request #1 from rulatir/fix/metadata-undefined-index

Fix/metadata undefined index - merge twistor#15 recreated against my fork

Author: rulatir

src/Flysystem/Plugin/Stat.php

@@ -154,7 +154,7 @@ protected function mergeMeta(array $metadata)
         $ret['gid'] = $this->uid->getGid();
 
         $ret['mode'] = $metadata['type'] === 'dir' ? 040000 : 0100000;
-        $ret['mode'] += $this->permissions[$metadata['type']][$metadata['visibility']];
+        $ret['mode'] += empty($this->permissions[$metadata['type']][$metadata['visibility']]) ? intval($metadata['visibility'], 8) : $this->permissions[$metadata['type']][$metadata['visibility']];
 
         if (isset($metadata['size'])) {
             $ret['size'] = (int) $metadata['size'];