really remove ghost lists

oml/setup.py

@@ -263,16 +263,11 @@ def upgrade_db(old, new=None):
                 u.clear_list_cache()
                 l.items_count()
             session.commit()
-    if old <= '20160106-500-4c87307':
-        with db.session() as session:
-            l = user.models.List.query.filter_by(name=' [2]', user_id=settings.USER_ID).first()
-            if l and not len(l.items):
-                l.delete()
-    if old <= '20160106-505-9689439':
+    if old <= '20160107-507-16c9807':
         with db.session() as session:
             for l in user.models.List.query.filter_by(name=' [2]'):
                 if not len(l.items):
-                    l.delete()
+                    l.remove()
 
 def create_default_lists(user_id=None):
     with db.session():