Duplicating and then undoing leaves a null actor in level

Regression
BROKEN: //UE4/Main CL 3227721 (Dev-Framework merge)
WORKING: //UE4/Main CL 3227387

When the user duplicates and then undoes the action, there will still be that actor in the level, but will be null (will have nothing set for component.

1. Open QAGame in editor.
2. Duplicate the floor mesh (I tried this with alt+drag and Ctrl+C/Ctrl+V).
3. Undo.

RESULT

In the Word Outliner, there will still be a second StaticMeshActor in the world (which will have it's component set to None).

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