[autoform] fix appearance of link to add inlined creation form
On entity creation, if there are some local permissions on the relation,
we have no way of checking them since neither the subject nor the object
of the relation exists yet. In such a case, we should add the link by
default, for consistency (see other places where we use
`may_have_permission`).
Closes #6711900
Add some entities
-----------------
As manager, you can access to entity creation forms by using the `site management`_ page.
.. _`site management`: ../manage
As regular user, the index page or the action box may propose some links to create entities according to the context.