added range exception handling
added range exception handling

https://app.asana.com/0/201954860780444/205761505868165

DannyEaton/growify,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209,rdicharry/growify-fork-20161209,DannyEaton/growify