Surface breaklines with 0 or 1 vertices?

[rkmcswain]

User has a surface that 'disappears" upon drawing open.
Turns out our startup code purges zero-length entities, and all but a couple of the break lines in this surface have either 0 or 1 vertex.
So when the zero-length entities are purged, the surface has no more definition and disappears.
Undoing that purge restores an otherwise normal looking surface.

Not sure how it's possible for a break line to have 0 or 1 vertices. Anyone else ever seen this?

[Opie]

Nope. I've never experienced it.

Could it possibly be counting only interior vertices and not also the end points?

[rkmcswain]

No. If you make a single polyline or breakline with two points (start > end), and add it to a surface, it shows up as 2 vertices.