[NTG-context] lmt_followtext crashes while standard followtext itself works

[Gerben Wierda]

> we can patch this
> 
>                if ad <> origin : rotated(angle(ad)) fi
> 
> in mp-blob.mpiv but I expect you to test if all still works then

Applied and tested, it works fine.

And it also provided me with an insight about if:else:fi that was slow in coming but now that I see it, I think “Duh, you should have realised that much sooner”.

Thanks,

G