Sybren A. Stüvel 59655ea770 Manager: fix error in sleep scheduler when shutting down
When the Manager was shutting down while the sleep scheduler was running, it
could cause a null pointer dereference. This is now doubly solved:

- `worker.Identifier()` is now nil-safe, as in, `worker` can be `nil` and
  it will still return a sensible string.
- failure to apply the sleep schedule due to the context closing is not
  logged as error any more.
2022-09-27 12:27:18 +02:00
..
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