fix stupid rendering hack/segfault
fix stupid rendering hack/segfault

This only had 0-8% runtime cost in a only moderately
optimized piece of code, and was going to need fixing!

(though someday we might prevent far enough away things
from ever getting into this)

Lasercake/Lasercake,idupree/Lasercake,elidupree/Lasercake,elidupree/Lasercake,idupree/Lasercake,Lasercake/Lasercake,Lasercake/Lasercake,Lasercake/Lasercake,idupree/Lasercake,elidupree/Lasercake,idupree/Lasercake,idupree/Lasercake,elidupree/Lasercake,elidupree/Lasercake,idupree/Lasercake,Lasercake/Lasercake,elidupree/Lasercake,idupree/Lasercake,elidupree/Lasercake