Hey all, I'm trying to figure out how to build a block structure in Vuo equivalent to an "if undefined" statement. Essentially, I have a subcomposition that may have incoming data, but otherwise should use defaults. I can see how one might do that with the "Select Input" and "Is ___ populated" nodes. Unfortunately though there's no "is shader populated" node, which I would need in this case. There's not some kind of generic "is undefined" node, is there? Or perhaps there's another way?