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[release/6.0] Check BackgroundService.ExecuteTask for null - #60177
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In some scenarios, derived classes might not have called base.StartAsync, and ExecuteTask will still be null. Ensure we don't fail in those cases. Fix#60131
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Backport of #60139 to release/6.0
/cc @eerhardt
Customer Impact
.NET 6.0 introduced an undocumented breaking change. IHostedService startup is now special-cased for BackgroundService, where the Host takes a direct dependency on BackgroundService.ExecuteTask, which can be null in some cases that previously worked. This was reported by a 1st party using 6.0 rc1.
The fix is a simple null check to avoid a NullReferenceException.
Testing
Added a new automated unit test for this scenario to ensure it works.
Risk
Very low.