fix unlikely error in upload magic where a user hasn't referenced any specimens ahead of time
fix unlikely error in upload magic where a user hasn't referenced any specimens ahead of time

Caoimhinmg/PmagPy,Caoimhinmg/PmagPy,lfairchild/PmagPy,lfairchild/PmagPy,Caoimhinmg/PmagPy,lfairchild/PmagPy