This query will find logins with a default db that is not online, and show any job(s) that login owns.

select sp.*, j.*

from sys.server_principals sp

left outer join msdb.dbo.sysjobs j on

j.owner_sid = sp.sid

where

sp.default_database_name not in (select d.name from sys.databases d where d.state_desc = 'ONLINE')