References stored in deleted UProperties stick around in a Blueprint Class

If a UProperty that stores a reference to an asset is deleted, the reference to that asset lingers in any Blueprints that had a reference stored in that UProperty. This can lead to issues when the referenced asset is altered/deleted. The reference also shows in the Reference viewer.

Regression?: No
This also occurred in 4.14

Workaround: Move any affected blueprints to another folder and then move them back, the reference will disappear.

1. Open the attached project (will need to generate project files / compile)
2. In MyActor.h, comment out lines #25 and #26 and compile the project to remove the UProperty
3. Delete the asset that was being referenced by this UProperty, NewAimOffsetBlendSpace, Force delete when it asks
4. Save the project and reopen it
5. Open the NewBlueprint asset
6. Check the Output log
   Result: Errors/warnings appear about the reference still existing although the UProperty is gone
   Expected: No errors/warnings appear