get-note-deck-name: Return nil if deck-id does not exist.

* Return nil if neck does not exist.  This is meant to make testing easier.

1 files changed, 1 insertions, 1 deletions

diff --git a/gnosis.el b/gnosis.el
index f513df1..bb91de3 100644
--- a/gnosis.el
+++ b/gnosis.el
@@ -711,7 +711,7 @@ Set SPLIT to t to split all input given."
 (defun gnosis-get-note-deck-name (id)
   "Return deck name of note ID."
   (let ((deck (gnosis-get 'deck-id 'notes `(= id ,id))))
-    (gnosis--get-deck-name deck)))
+    (and deck (gnosis--get-deck-name deck))))
 
 (defun gnosis-get-deck--note (id &optional name)
   "Get deck id for note ID.