[fixed] bug with select-by-short-edges

[rv3]

I'm having issues with Select-By-Short-Edges on a particular file. It works in other files, so something in this one seems to be tickling the bug. Every time I try to do the command, it pops up the "Length tolerance" dialog box and then immediately pops up another box that says there was an "Internal Error", gives a pathname to a crash dump (attached) and tells me to restart Wings3d.

I'm running 2.1.7 development release on a macosx system 10.13.5.