[dj803]

A destroyed entity still answers isValid(), but its other methods and fields are gone, so calling them errors. When this happens inside update(), the same line usually fails every frame. After 5 errors in a row GameGlobalInfo::update stops calling update() for the rest of the game, so there is no more plot, no more waves and no win or loss check.

Scenario	Trigger	Fix
27 Liberation Day	an object is destroyed after its nova distance was measured	the nova loops skip invalid objects
39 Locust Swarm	a swarm ship is killed while the swarm gathers	gatherSwarm skips invalid ships
47 Scurvy Scavenger	the player ship is lost	setPlayer returns early
58 Fermi 500	an empty getPlayerShip(i) slot (non-nil, not valid)	gatherStats checks isValid()
79 Kessler	player1 is destroyed	mission_start_state checks isValid()
81 Clash in Shangri-La	a flagship is destroyed (20 s respawn gap)	reputation is only added to a valid flagship

Testing: each error was reproduced by automated headless runs, which then finished with no Lua errors after the fix (81 ran to victory). I did not try these by hand on a release build.

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