Handle player deaths where attacker or victim data is missing

[todo]

Koyi/src/match/demo/detectors/Kills.ts

Lines 31 to 36 in 42f78a6

	// TODO: This probably happens during suicide? Not sure, has to be investigated and handled correctly
	if (!victim || !attacker) {
	return;
	}
	this.logger.debug(

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This issue was generated by todo based on a TODO comment in 42f78a6 when #60 was merged. cc @Bantr.