make directivity handling more robust

Source/VAPlugin/Private/SoundSource/VAAbstractSourceComponent.cpp

@@ -489,11 +489,19 @@ bool UVAAbstractSourceComponent::SetDirectivityByFileName(const FString FileName
 
 bool UVAAbstractSourceComponent::SetDefaultDirectivity()
 {
+	if (!ShouldSendCommand())
+	{
+		return false;
+	}
 	return SoundSource->SetDirectivity(FVADirectivityManager::GetDefaultDirectivity());
 }
 
 bool UVAAbstractSourceComponent::SetNoDirectivity()
 {
+	if (!ShouldSendCommand())
+	{
+		return false;
+	}
 	return SoundSource->RemoveDirectivity();
 }