[BUG] `org-display-outline-path` before first heading report error caused it can't used in (:eval ) in `header-line-format`

[Christopher M. Miles]

I have bellowing config in my Emacs to show heading outline path in header-line.

#+begin_src emacs-lisp
(setq-mode-local org-mode
                 header-line-format
                 '(:eval (ignore-errors
                           (concat
                            " " (nerd-icons-faicon "nf-fa-heading" :face 
'nerd-icons-red) "  "
                            ;; FIXME: user-error: "Before first headline at 
position 30 in buffer discourse-graphs.org"
                            (org-display-outline-path nil t " 〉 " t)))))
#+end_src

I found the header-line Org heading outline path will disappeared sometimes.
Then I debug it show figure out why with `with-demoted-errors`:

#+begin_src emacs-lisp
(setq-mode-local org-mode
                 header-line-format
                 '(:eval (with-demoted-errors
                             "Error: display Org mode heading outline path 
error: %S"
                           (concat
                            ;; " " (nerd-icons-icon-for-mode 'org-mode) " "
                            " " (nerd-icons-faicon "nf-fa-heading" :face 
'nerd-icons-red) "  "
                            ;; FIXME: user-error: "Before first headline at 
position 30 in buffer discourse-graphs.org"
                            (ignore-errors (org-display-outline-path nil t " 〉 
" t))))))
#+end_src

I hope org-mode can fix this error.

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[ stardiviner ]
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