ensured the sum_file variable exists so that there is no longer an AttributeError when trying to generate depth/remnance plots
ensured the sum_file variable exists so that there is no longer an AttributeError when trying to generate depth/remnance plots

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