Fix bug in install script
Fix bug in install script

Do not treat unbound variables as an error.

pulgalipe/dotbot,anishathalye/dotbot,imattman/dotbot,imattman/dotbot,bchretien/dotbot,bchretien/dotbot,pulgalipe/dotbot,StijnRuts/dotbot,StijnRuts/dotbot,pulgalipe/dotbot,bchretien/dotbot,anishathalye/dotbot,StijnRuts/dotbot,imattman/dotbot