fix read empty dir bug

Author: sabakugaara

src/Upyun/Upyun.php

@@ -129,7 +129,7 @@ public function read($path, $saveHandler = NULL, $params = array()) {
                 return $response->getBody()->getContents();
             }
         } else {
-            $files = Util::parseDir($response->getBody());
+            $files = Util::parseDir($response->getBody()->getContents());
             return array('files' => $files, 'is_end' => $params['x-upyun-list-iter'] === 'g2gCZAAEbmV4dGQAA2VvZg', 'iter' => $params['x-upyun-list-iter']);
         }
     }

src/Upyun/Util.php

@@ -24,7 +24,7 @@ public static function getHeaderParams($headers) {
     public static function parseDir($body) {
         $files = array();
         if(!$body) {
-            return array('files' => $files, 'is_end' => true);
+            return array();
         }
 
         $lines = explode("\n", $body);