bugfix(gameengine): Prevent crash when OCL source object is null or destroyed

[seer-by-sentry]

Fixes CLIENT-47D. The issue was that: Dying object's memory freed before new objects attempt to access its Contain module, causing use-after-free.

• Added a check to ensure the sourceObj is valid (not null and not destroyed) before attempting to contain a newly created object within it.
• If the sourceObj is invalid, the newly created object is immediately destroyed to prevent further issues.
• Addresses potential crashes or unexpected behavior that could occur when an Object Creation List (OCL) fires from a CreateObjectDie handler and the source object is no longer valid.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 12576880

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