[PATCH 01 of 23] web: use '_unset' default value for proxy config method

[Boris Feld]

# HG changeset patch
# User Boris Feld <boris.feld at octobus.net>
# Date 1505496068 -7200
#      ven. sept. 15 19:21:08 2017 +0200
# Node ID 8f9210de17d825ec69c4cdb266398b941a088275
# Parent  709b44f38ab919c4f858f12807b9f01f6a2ee888
# EXP-Topic config.register.web
web: use '_unset' default value for proxy config method

This special value is needed to make sure registered default value are taken in
account.

diff -r 709b44f38ab9 -r 8f9210de17d8 mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py	mar. sept. 12 09:13:02 2017 -0700
+++ b/mercurial/hgweb/hgwebdir_mod.py	ven. sept. 15 19:21:08 2017 +0200
@@ -491,7 +491,7 @@
             else:
                 yield config('web', 'motd', '')
 
-        def config(section, name, default=None, untrusted=True):
+        def config(section, name, default=uimod._unset, untrusted=True):
             return self.ui.config(section, name, default, untrusted)
 
         self.updatereqenv(req.env)