[Freeciv-Dev] (PR#13038) need better feedback when script function doesn't exist

["Vasco Alexandre da Silva Costa" <vasc@xxxxxxxxxxxxxx>]

<URL: http://bugs.freeciv.org/Ticket/Display.html?id=13038 >

> [per - Fri Aug 26 20:06:02 2005]:
> 
> When I try to define a fake function, I get this when lua tries to
call it:
> 
> 1: data/default/script.lua:4: attempt to call global `fake_function' (a
> nil value)
> 
> That isn't so bad. I wonder why your error message was so bad, though.

Because his script is embedded in a savedgame. script.lua is a plain lua
script file.