move files;cleanup empty folders

oml/item/models.py

@@ -618,6 +618,8 @@ class File(db.Model):
             shutil.move(current_path, path)
             self.path = new_path
             self.save()
+            for folder in set(os.path.dirname(p) for p in [current_path, path]):
+                remove_empty_folders(folder)
 
     def save(self):
         state.db.session.add(self)