[0.12.4] Reproducible crash on launching rocket in multiplayer with mods

[Narc]

I'm not entirely sure what happened from the log, so here's all the interesting data:

• log: http://dev.narc.ro/factorio/crashy-launch.log
• save: http://dev.narc.ro/factorio/crashy-launch.zip
• mods: http://dev.narc.ro/factorio/crashy-launch-mods.tar.gz

To reproduce:

• Load the world into a headless server
• Connect to the server, make your way to the launch facility at the east end of the big factory to your north
• Hit the launch button

After the beautiful launch animation, the server will die; your client will wait for it to come back (with the victory GUI in the foreground) until it times out, after which the victory sound will loop until you close the victory GUI.

[Oxyd]

What happened is the server tried to pop open the Game Finished dialog and failed for obvious reasons. Fixed in 0.12.5.