[Therion] Bus error - caused by single point line??

[John Pybus]

Martin Sluka wrote:
> 
> 
> Just one strange think (I don't know if it is the source of error!). You 
> use a bit strange definition of lakes there - areas water. They are 
> defined by bottom wall and the water level is defined by another line 
> wall -outline in. See attached picture 1.

That was not a very good way of doing things, and we've fixed it (thanks 
for pointing it out), but I think we've found what was causing the bug, 
it was this:

+line wall -close off
+  320.0 -3625.0
+endline

Somehow we'd managed to create a line with only one point.  We'd 
actually noticed this before (and even isolated a test-case, but 
forgotten to send it to the list).  That case is attached.

There's little point to having a line with only one point -- it would 
very nice if therion provided an error message to warn about them.

Cheers,
John

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