Fix crash in Internal::Load when onIl2CppLoaded list is empty

[auag0]

Summary

Fixed a crash that occurred in Internal::Load when no events were registered in onIl2CppLoaded.

Problem

The BNM::ForwardList used for onIl2CppLoaded is a circular linked list.
When the list is empty, lastElement is nullptr. The existing code attempted to access lastElement->next without checking if the list was empty, leading to a null pointer dereference and a crash.

Solution

Added an IsEmpty() check before entering the event dispatching loop.
If no events are registered, the function now returns early safely.

Impact

• Prevents crashes when AddOnLoadedEvent has not been called.
• Ensures safe behavior regardless of whether events are registered.
• No negative impact on existing functionality.

Test

Verified that the application no longer crashes when the event list is empty, and events are still called correctly when registered.