Allow empty lines at the beginning of a server scope

[arturjpv]

Developers are having problems if they don't place the ifdef right after the check(System::IsServer()), as the server scope is compared starting after the check and we fail to detect that the server scope is already protected.

	UFUNCTION(BlueprintOverride)
	void Tick(float DeltaSeconds)
	{
		FTraceScope TraceScope(n"UGaitGroundContactHelperComponent::Tick");
		check(System::IsServer());

#ifdef WITH_SERVER
		GroundContactHitResults.Empty();
#endif
	}

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