Crash when locate_bound_objects is called

This has been tested internally using an editor utility widget yielding the same results. That small project is attached. BoundingObjectTest.

1) Open the project

2) Run the Editor Utility Widget and click the button

Repro steps:

1. Create a sequence.
2. Add a possessable binding e.g. a cube.
3. Delete the cube so that the binding is broken.
4. Run the following python (or comparable Blueprint)

```
import unreal
 
ls = unreal.LevelSequenceEditorBlueprintLibrary.get_current_level_sequence()
print(ls)
 
w = unreal.get_editor_subsystem(unreal.UnrealEditorSubsystem).get_editor_world()
print(w)
 

1. Assumes there is only one possessable –
   for b in ls.get_possessables():
       ls.locate_bound_objects(b, w)
    

```

Crash. This should return None or an empty array.