[PATCH] MissileHit: TypeError: cmpHealth is null

[elexis]

In the attached replay with r18625, this error occured a number of times throughout the game:

ERROR: Error in timer on entity 1, IID 57, function MissileHit: TypeError: cmpHealth is null
  Armour.prototype.TakeDamage@simulation/components/Armour.js:66:2
  Damage.prototype.CauseDamage@simulation/components/Damage.js:215:6
  Damage.prototype.CauseSplashDamage@simulation/components/Damage.js:194:4
  Damage.prototype.MissileHit@simulation/components/Damage.js:101:4
  Timer.prototype.OnUpdate@simulation/components/Timer.js:100:4

[bb]

This seems to be caused by a missing check. The entity in the replay are fishes accidentaly being hit by targetting ships, which indeed have no health. (testing this patch with the replay gives a oos instead of error, which is obvious and harmless)

[leper]

In 18643:

Remove Armour from fish templates. Fixes #4169.

Given that Armour needs Health disabling one but not the other is an error.

[leper]

There is no check there because failing that line means there is a bug somewhere else, stop trying to hide such things but fix the root cause.