Killed Org files referred from the agenda?

[pinard@iro.umontreal.ca (François Pinard)]

Hi, Org people!

Now that many Org files are part of my agenda list, it became more
likely that I inadvertently kill one of them.  Then, commands like "t"
or "RET" in the agenda fail.

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  goto-char(nil)
  (let* ((marker ...) (buffer ...) (pos ...)) (org-pop-to-buffer-same-window buffer) (and delete-other-windows (delete-other-windows)) (widen) (goto-char pos) (when (eq major-mode ...) (org-show-context ...) (save-excursion ...) (when ... ...)))
  (if (and org-return-follows-link (not ...) (org-in-regexp org-bracket-link-regexp)) (org-open-link-from-string (match-string 0)) (let* (... ... ...) (org-pop-to-buffer-same-window buffer) (and delete-other-windows ...) (widen) (goto-char pos) (when ... ... ... ...)))
  org-agenda-switch-to()
  call-interactively(org-agenda-switch-to nil nil)
--8<---------------cut here---------------end--------------->8---

I have to first revisit the Org file by some other mean first, for such
commands to succeed.  Could Org do the revisiting as needed, instead of
raising an error?

François