Merge pull request #7416 from owncloud/share_api_7311

[share api] only add "received_from" field if a share was found

apps/files_sharing/lib/api.php

@@ -172,12 +172,12 @@ class Api {
 			// workaround because folders are named 'dir' in this context
 			$itemType = $file['type'] === 'file' ? 'file' : 'folder';
 			$share = \OCP\Share::getItemShared($itemType, $file['fileid']);
+			if($share) {
 				$receivedFrom =  \OCP\Share::getItemSharedWithBySource($itemType, $file['fileid']);
 				if ($receivedFrom) {
 					$share['received_from'] = $receivedFrom['uid_owner'];
 					$share['received_from_displayname'] = \OCP\User::getDisplayName($receivedFrom['uid_owner']);
 				}
-			if ($share) {
 				$result = array_merge($result, $share);
 			}
 		}