--- a/mercurial/cmdutil.py	Sat Mar 17 15:22:14 2018 +0900
+++ b/mercurial/cmdutil.py	Sat Mar 17 11:23:04 2018 +0900
@@ -907,7 +907,7 @@
     mapping = {'ctx': ctx, 'revcache': {}}
     if props:
         mapping.update(props)
-    return t.render(mapping)
+    return t.renderdefault(mapping)
 
 def _buildfntemplate(pat, total=None, seqno=None, revwidth=None, pathname=None):
     r"""Convert old-style filename format string to template string