--- a/mercurial/hgweb/hgweb_mod.py	Wed Aug 05 22:13:51 2020 -0700
+++ b/mercurial/hgweb/hgweb_mod.py	Thu Aug 06 09:50:10 2020 -0700
@@ -78,7 +78,7 @@
         locations = (os.path.join(style, b'map'), b'map-' + style, b'map')
 
         for location in locations:
-            mapfile, fp = templater.open_template(location, path)
+            mapfile, fp = templater.try_open_template(location, path)
             if mapfile:
                 return style, mapfile, fp