With CMS-8995 there is no more validation of links between contents when a content is removed from a page, so there is still the dialog box asking to delete the content if it is no other pages.

When validated, the callback says that the content can not be deleted because it is already linked.

Repro steps :

1. Create a content on a page
2. Create a content that can link another content (exaustif ?)
3. Remove the 1st content from it's page
4. Confirm the dialog that asks to delete the content

Expected result : there should be no dialog box to delete the content as it is linked to another content