Cant build a 1x1 keyboard.

It doesn't look like it is possible to build a `1x1` keyboard with the builder?
I tried with 
    [{sm:"cherry",sb:"gateron",st:"KS-3-Tea",a:7},""]
and got no drawing adn theese stats 
> * Width: 0.001mm 
> * Height: 0.001mm
> * Surface Area: -196.000mm2
> *  Cut Path Length: 0.004mm
