Also insert ownership if nobody else owns

db_setup.py

@@ -82,7 +82,7 @@ def seed(cursor):
     (user_id, ownable_id, amount)
     SELECT (SELECT rowid FROM users WHERE username = 'bank'), 
             ownables.rowid, 
-            (SELECT SUM(amount) FROM ownership WHERE ownable_id = ownables.rowid)
+            (SELECT COALESCE(SUM(amount),0) FROM ownership WHERE ownable_id = ownables.rowid)
     FROM ownables WHERE
     name <> ?
     ''', (CURRENCY_NAME,))