Area/Volume calculation failure yields 0 in output

[fgrunewald]

Is it correct that according to these lines a failure in the area volume calculation yields 0s? Would np.nan be more sensible?

shocker/bin/shocker

Lines 470 to 473 in 0801a19

	except IndexError:
	vol_area = [0, 0, 0]
	inner_conc = 0
	outer_conc = 0