[therion] Segfault when including survey data in plan

[Stacho Mudrak]

Wookey wrote:

> This looks like a bug. And is there some subtlty about adding surveys
> (centrelines) to maps?


Yes, it is a bug. I have downloaded your data, made your changes and it really fails - no idea why, but I will fix it.

If you would like to have map with centerline also, create a separate map with centerline only - it should work with it (at least on my machine it worked - see attached picture).

Regards, S.