Fix null projectile type crash in turret shoot

[cursor]

Add null checks to ASentryTowerTurret::Shoot to prevent crashes when ProjectileType is unset or projectile spawning fails.

The ProjectileType can become null (e.g., when the 'Wrath' modifier is selected), causing SpawnActor to return nullptr. Subsequent attempts to access members of the null Projectile pointer lead to an EXCEPTION_ACCESS_VIOLATION_WRITE. This PR adds checks to ensure ProjectileType is valid and that a projectile was successfully spawned before attempting to access its members.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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