[release/5.0] Don't call HttpCloseUrlGroup if you didn't create it #28511
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Backporting #28336 to 5.0
Description
HttpSysRequestDelegationFeature - DelegationRule.Dispose() - Call to HttpCloseUrlGroup Fails with result ERROR_INVALID_PARAMETER
Customer impact
Backport requested by @NGloreous. Has been validated by him
Results in a null ref that the customer needs to catch if #28494 isn't merged
Regression
No. This is a new feature introduced in 5.0
Risk
Very low.