in utils.plot_fragility plotting also functions with sigma=0
in utils.plot_fragility plotting also functions with sigma=0

mabevillar/rmtk,dynaryu/rmtk,GEMScienceTools/rmtk,ccasotto/rmtk,GEMScienceTools/rmtk,mabevillar/rmtk,dynaryu/rmtk,ccasotto/rmtk