[PR #5896/2bef8a39 backport][3.65] Fix scheduled task purge failing without user #5899
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This is a backport of PR #5896 as merged into main (2bef8a3).
When a task was dispatched by a task schedule, there is no user attached to it. So purge tasks should just look at all tasks. However when a user gets deleted after dispatching that task, the task will run with current_user=None also. We need to make sure not to purge too many tasks in this case.
fixes #5881