Merge pull request #11726 from owncloud/s3-fixunittests

Fix S3 folder creation for new AWS API

apps/files_external/lib/amazons3.php

@@ -156,6 +156,7 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 			$this->getConnection()->putObject(array(
 				'Bucket' => $this->bucket,
 				'Key' => $path . '/',
+				'Body' => '',
 				'ContentType' => 'httpd/unix-directory'
 			));
 			$this->testTimeout();