fix passing optional debug argument

xtreemfs_client/OSDManager.py

@@ -155,7 +155,7 @@ class OSDManager(object):
                                        None)
             new_folders.append(new_folder)
 
-        new_assignments = self.distribution.add_folders(new_folders)
+        new_assignments = self.distribution.add_folders(new_folders, debug=self.debug)
 
         if apply_layout:
             self.apply_osd_assignments(new_assignments)