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When you have a formula with only 1 atom of the element (let's say H2O or HPO4), the function "parse_formula(formula)" would crash in line 123
composition[_make_isotope_string(elem, int(isotope) if isotope else 0)] += int(number)
with error:Changing the line to:
composition[_make_isotope_string(elem, int(isotope) if isotope else 0)] += int(number) if number else 1
fixes that error