Save while summon control

[Repton]

I tried saving the game whilst controlling a summon. This error showed up in the log:

Lua Error: /mod/class/Game.lua:245: bad argument #3 to 'format' (string expected, got nil)
At [C]:-1
At [C]:-1 format
At /mod/class/Game.lua:245 getSaveDescription
At /engine/Savefile.lua:156 saveGame
At /mod/dialogs/Quit.lua:36 ?
At /engine/KeyBind.lua:198

No long-term problem; able to save and load fine after ending the control.

[darkgod]

Fixed