Fix crash seen when deleting a 3D view part of a linked view collection

ApplicationLibCode/Commands/RicDeleteItemExec.cpp

@@ -65,6 +65,9 @@ void RicDeleteItemExec::redo()
             m_commandData.m_deletedObjectAsXml = xmlObj( obj )->writeObjectToXmlString();
         }
 
+        // Make sure the object is disconnected from other objects before delete
+        obj->prepareForDelete();
+
         delete obj;
 
         listField->erase( m_commandData.m_indexToObject );