[Orgmode] bug with %^{Property}p in org-remember templates

[Adam Spiers]

The code for handling %^{PROP}p in org-remember templates seems to
have a bug:

             ((equal char "p")
              (edebug)
              (let*
                  ((prop (org-substring-no-properties prompt))
                   (pall (concat prop "_ALL"))
                   (allowed
                    (with-current-buffer
                        (get-buffer (file-name-nondirectory file))

Here get-buffer can return nil, in which case `org-remember' fails
with the error:

  Wrong type argument: stringp, nil

It seems to be assuming that the non-directory part of the filename
corresponds to the buffer name, but this is not guaranteed.  Perhaps I
noticed it because I am using uniquify.el ?