[LDCad] Crash LDCad looking for brick 3940

[Jaco van der Molen]

That should not crash anything, so it's a bug.

I fixed it in the 1.7 Beta 1 code.

OK, crash is in 1.7 Alpha 2 btw.
@Roland: Since you fixed it, I suppose you do not need the log or anything

@Evert-Jan: I will replace the subfile and see if I can use either old part 3940b or the new 19789.

Needless to say perhaps, but is the correct version of 19789s01 on the partstracker for the next release ;-)