Hotfix for "LUA PANIC" crash when joining a netgame

Turns out that it's possible to cause Lua to panic by setting a function, thread or light userdata (or otherwise unrecognised data type) as a table's key. When the server tries to write one of these data types to the $$$.sav for someone joining the netgame, these are instead written as nil type. At the other end, for the person joining the netgame, a "LUA PANIC" crash occurs because of a table key being nil when fed into lua_rawset (a function that actually sets table[key] = value for a particular table).

Now, you just get a bunch of console errors for both the server and joiners, to alert both somebody goofed up a Lua script by using any of those unaccepted key types. (Or perhaps corrupted the savegame) But the game should run fine otherwise, not crash.

added 2 commits

• 82f2f2f2 - 1 commit from branch next
• 0f99fdad - Merge branch 'next' into lua-archive-crash-hotfixes

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merged

mentioned in commit b898dc39