[surface model] Fix logic for polyhedrons
This is a follow up to !1088 (merged), which overlooked the corner case of having just one segment in polyhedrons. It was failing for CMS2018 and 2026, now it is fixed.
This is a follow up to !1088 (merged), which overlooked the corner case of having just one segment in polyhedrons. It was failing for CMS2018 and 2026, now it is fixed.