Optional delegate properties

Development Programming & Scripting Blueprint
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1

Is it possible to make a delegate property optional to blueprints? ie

UDELEGATE()
DECLARE_DYNAMIC_DELEGATE_OneParam(FMessageBoxCallback, const FKey&, KeyPressed);

USTRUCT(BlueprintType)
struct FMessageBoxData
{
	UPROPERTY(BlueprintReadWrite)
	FMessageBoxCallback ConfirmCallback;

	UPROPERTY(BlueprintReadWrite)
	FMessageBoxCallback CancelCallback;
};

I want to make ConfirmCallback and CancelCallback optional for blueprints. Right now 99% of my implementation for this does nothing on cancel, but I still have to give it a callback that doesn’t do anything. Is this possible?

Thanks,