No warning that soft references will be broken when deleting an actor

Deleting an actor that has soft references to it will not trigger a message box to confirm the deletion nor provide the list of other actors that reference it unless they are dirty.

• Create/Open a OFPA/WP enabled map.
• Add an actor (i.e. cube).
• Add an actor that has a soft ref to another actor and set that soft ref to the cube.
• Save all.
• Delete the cube.
• Notice that no warning will appear.