Fixes LDAP Fileset browsing in restore filetree

This is a workaround which should fix the following bug reported.

bvfs_lsdirs should deliver @LDAP/ if path argument is left empty like it's
giving a / for *nix and all drives for windows clients on top level.

It currently only works if path argument get's an @, like:

*.bvfs_lsdirs jobid=684,691 path=@
282 0 0 0 A A A A A A A A A A A A A A .
282 0 0 0 A A A A A A A A A A A A A A ..
281 0 0 0 A A A A A A A A A A A A A A @LDAP/
282 0 0 0 A A A A A A A A A A A A A A @

Fixes #597: Python LDAP Plugin Fileset not visible in restore

module/Restore/src/Restore/Model/RestoreModel.php

@@ -59,7 +59,15 @@ public function getDirectories($jobid=null, $pathid=null) {
          $result = $this->director->send_command($cmd, 2, $jobid);
          $directories = \Zend\Json\Json::decode($result, \Zend\Json\Json::TYPE_ARRAY);
          if(empty($directories['result']['directories'])) {
-            return null;
+            $cmd = '.bvfs_lsdirs jobid='.$jobid.' path=@';
+            $result = $this->director->send_command($cmd, 2, $jobid);
+            $directories = \Zend\Json\Json::decode($result, \Zend\Json\Json::TYPE_ARRAY);
+            if(empty($directories['result']['directories'])) {
+               return null;
+            }
+            else {
+               return $directories['result']['directories'];
+            }
          }
          else {
             return $directories['result']['directories'];
@@ -82,7 +90,15 @@ public function getFiles($jobid=null, $pathid=null) {
          $result = $this->director->send_command($cmd, 2, $jobid);
          $files = \Zend\Json\Json::decode($result, \Zend\Json\Json::TYPE_ARRAY);
          if(empty($files['result']['files'])) {
-            return null;
+            $cmd = '.bvfs_lsfiles jobid='.$jobid.' path=@';
+            $result = $this->director->send_command($cmd, 2, $jobid);
+            $files = \Zend\Json\Json::decode($result, \Zend\Json\Json::TYPE_ARRAY);
+            if(empty($files['result']['files'])) {
+               return null;
+            }
+            else {
+               return $files['result']['files'];
+            }
          }
          else {
             return $files['result']['files'];