Infinite loop on Save when creating a page from a template without rights

Infinite loop on Save or Save&View when trying to save a page created from a template, when the user doesn't have view rights on the template page.

This issue is a regression of XWIKI-18430.

Steps to reproduce:

• With an admin, create a page called Sandbox.SecretPage (terminal in my example, but probably reproduces with non-terminal as well)
• Add some content to it, for example, "Secret content. If you see this it's bad."
• Edit rights on the page, give view rights only to the admin group on the page

Switch to a regular user

• use a creation like URL that uses Sandbox.SecretPage as template:
  [...]/xwiki/bin/edit/Sandbox/NewPage/WebHome?template=Sandbox.SecretPage&parent=Sandbox.WebHome&title=NewPage

Expected result:

• the content of Sandbox.SecretPage is not displayed, but you can save an empty page.

Actual result:

• An infinity loop is displayed

The action can be canceled. A page without content will be created.