knadh
Fix #1155. Empty output subscribers query, who finish campaign
Fix problem Campaign goes to finished status without reaching all subscribers #1155.
It was in us, when we import big blacklisted base at start work with listmonk, and future lists have blocklisted subscribers but they wasn't unsubscribed. It was problem, because at first sample in query, find only unsubscribed emails, but in finish all unsubscribed finish transform in empty, because all of them is blacklisted. This element stop campaign, despite the remaining large number of emails on the mailing list, despite the remaining large number of emails on the mailing list.
I think, that this fix haven't big performanse degradate, because subIds select work in same logical framework and conditions, and this is logical true. Also it fix #929 , without create multiple unsubscribed records on all lists in listmonk for all blocklisted user.
Thank you. Will test this on a large DB with millions of records over the weekend.
