mercurial/chgserver.py

--- a/mercurial/chgserver.py	Sat Mar 25 13:50:17 2017 -0400
+++ b/mercurial/chgserver.py	Sat Mar 25 21:12:00 2017 -0400
@@ -193,6 +193,7 @@
         def _runpager(self, cmd):
             self._csystem(cmd, util.shellenviron(), type='pager',
                           cmdtable={'attachio': attachio})
+            return True
 
     return chgui(srcui)