Add null checks for pObject->Owner in Team/Body.cpp

[Copilot]

Several functions in Team/Body.cpp access pObject->Owner->Type->MultiplayPassive without null-checking pObject->Owner first, risking null pointer dereference.

Changes

• Added || !pObject->Owner guard to the existing IsAlive check in:
  • HouseOwns
  • EnemyOwns
  • NeutralOwns
  • HouseOwnsAll
  • NeutralOwnsAll

The EnemyOwnsAll function already had this pattern implemented.

// Before
if (!TechnoExtData::IsAlive(pObject))
    continue;

// After
if (!TechnoExtData::IsAlive(pObject) || !pObject->Owner)
    continue;

Original prompt

give null checks in Team/Body.cpp

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