[BUG] Partially broken Org mode when remote setupfile is unavailable

[Max Nikulin <manikulin@gmail.com>]

Hi,

I have tried the following .org file

--- 8< ---
#+setupfile: /dav:localhost#8000:/setup-dav-123.org

* Heading

[[https://orgmode.org/][Link]]
--- >8 ---

Having no webdav server running. Expected error:
> Package ‘tramp-gvfs’ not supported
> File mode specification error: (user-error Package `tramp-gvfs' not supported)

Unexpected errors:
- When point is on any non-empty line, RET is broken
> save-excursion: Wrong type argument: stringp, nil
- The link is not fontified (it is parsed properly however and even may 
be opened).

In the case of unavailable http: setupfile, RET is not broken,
but the link is not fontified.

--- 8< ---
#+setupfile: http://localhost:8000/setup-http-987.org

* Heading

[[https://orgmode.org/][Link]]
--- >8 ---

I expect that inaccessible setupfiles are just ignored and Org should 
work as without "#+setupfile:" lines.

Emacs-28 Org current main HEAD.