Florian Draxler

.RaiseAsync throws exception when used with a void delegate, no exception info for wrong using

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## Describe the Bug When raising a event with `.RaiseAsync()` with a void Delegate like `public delegate void MySampleDelegate(int nummer, bool istAktiviert);` the `.RaiseAsync()` methode gives a `System.NullReferenceException` because it...

Fix for #1568 when RaiseAsync with a void Delegate returns null results in System.NullReferenceException

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Hi this is my best guess on improving information on issue when try to use the `RaiseAsync()` with a void Delegate with a more informativ Exception. this is my first...