Prevent GenCrossSectionto_string from accessing non-existing elements
Prevent GenCrossSection::to_string from accessing non-existing elements.
For an empty GenCrossSection the to_string should not access the element 0 of the cross-section.
Prevent GenCrossSection::to_string from accessing non-existing elements.
For an empty GenCrossSection the to_string should not access the element 0 of the cross-section.
merged
mentioned in commit 2faf4a89