Cannot export miter template of frame including extra tube attached to one tube only

Hey!

Everything is in the title :)

I build my frames with the top tube "crossing" the seat tube (GT like) so I'm very happy that we can model it now!

I modeled a frame like this and wanted to export the miter template but nothing happens : no pdf is generated. I deleted theses tubes and it worked as usual...

I can do without it so it's not so much a problem for me, I'm just reporting the problem.

Cheers,

Nicolas.