--- a/tests/test-template-functions.t	Wed Dec 12 22:19:57 2018 +0900
+++ b/tests/test-template-functions.t	Wed Dec 12 22:45:02 2018 +0900
@@ -635,11 +635,9 @@
   no
 
  group reference with no match
- (TODO: we'll probably want to map it to an empty value)
 
   $ hg log -R a -r2 -T '{search(r"q", desc) % "match: {0}"}\n'
-  hg: parse error: None is not iterable of mappings
-  [255]
+  
 
  bad group names