I've otherwise stated that you can hide this block. In my case, I hide it in an existing model (and make it have a sky texture to get sky objects to work). Of course, you don't have to have it as a 64x64x64 size or something big like that, 2x2x2 is sufficient enough, but I suggest using 3x3x3 or 4x4x4 to prevent possible build errors.