Patch to fix attached.
From a3af9004fbc5a8a86ba8f990d393403ec671f9bf Mon Sep 17 00:00:00 2001
From: Robert Irelan <rmire...@google.com>
Date: Wed, 23 Jan 2019 11:11:14 -0800
Subject: [PATCH] org-drill: Fix tag match in org-map-drill-entries
* contrib/lisp/org-drill.el: Change MATCH argument to ORG-MAP-ENTRIES
from "" to nil.
Without this, org-tags-expand will throw an error on the empty string.
---
contrib/lisp/org-drill.el | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/contrib/lisp/org-drill.el b/contrib/lisp/org-drill.el
index c7f509bff..895003395 100644
--- a/contrib/lisp/org-drill.el
+++ b/contrib/lisp/org-drill.el
@@ -1483,10 +1483,10 @@ the current topic."
(when (and (not (org-invisible-p))
(> (org-current-level) drill-entry-level))
(when (or (/= (org-current-level) (1+ drill-entry-level))
- (funcall test))
+ (funcall test))
(hide-subtree))
(push (point) drill-sections)))
- "" 'tree))
+ nil 'tree))
(reverse drill-sections)))
--
2.20.1.321.g9e740568ce-goog
