Is there a way to determine if an extensionBoundUserServerVariable exists?

[daperson1]

There doesn't seem to be a doesExtensionBoundUserServerVariableExist function (Which would be a travesty of function naming in any case), so what is the way of determining if one exists? Is getExtensionBoundUserServerVariable's returned ExtensionBoundUserServerVariableResponse object's isSuccess() supposed to provide this functionality? I tried this, and got a lot of null pointer exceptions (Seemingly it returned isSuccess() == true, but getValue() == null...)
I mean, sure, I can do a mess with try..catch, but a neater way would be cool...