[test coverage] decide_workers never returns None in the unit tests
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Description
https://github.com/dask/distributed/blob/223c8154d7abee9837399933b8b2db5f78d9a278/distributed/scheduler.py#L1951-L1956
This bug makes everything crash with AttributeError whenever the top-level function ``decide_workers`` returns None.
However, no unit test (where validate=True) catches this.
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