[elpa] externals/denote a8c286577c: Make denote-file-has-identifier-p not error out

[ELPA Syncer]

branch: externals/denote
commit a8c286577c3b084541d95cdfc5a44d30391e6a20
Author: Protesilaos Stavrou <info@protesilaos.com>
Commit: Protesilaos Stavrou <info@protesilaos.com>

    Make denote-file-has-identifier-p not error out
    
    This is because it might get a nil value from buffer-file-name and we
    do not want an error in such a case.
---
 denote.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/denote.el b/denote.el
index fb2d921ad5..2028c2e90d 100644
--- a/denote.el
+++ b/denote.el
@@ -516,8 +516,9 @@ and use one of the extensions implied by 
`denote-file-type'."
 
 (defun denote-file-has-identifier-p (file)
   "Return non-nil if FILE has a Denote identifier."
-  (let ((file-name (file-name-nondirectory file)))
-    (string-match-p (concat "\\`" denote-id-regexp) file-name)))
+  (when file
+    (string-match-p (concat "\\`" denote-id-regexp)
+                    (file-name-nondirectory file))))
 
 (define-obsolete-function-alias
   'denote--file-has-identifier-p