Removing the parent page of a selected child page will produce an error

Steps to reproduce:
1. Create page 'Test Page'
2. Create child page 'Child Test page'
3. Go to the 'Child Test page'
4. Manage > Page > select the 'Test Page'
5. Delete the 'Test Page'
6. If necessary (like 6.2.x) close the dialog popup and wait for page load/redirect
7. You can see in the browser a 'Not Found' 'The requested resource was not found.' error message.