configitems: register the 'web.motd' config

mercurial/configitems.py

@@ -730,6 +730,9 b" coreconfigitem('web', 'errorlog',"
 coreconfigitem('web', 'ipv6',
     default=False,
 )
+coreconfigitem('web', 'motd',
+    default='',
+)
 coreconfigitem('web', 'name',
     default=dynamicdefault,
 )

mercurial/hgweb/hgweb_mod.py

@@ -177,7 +177,7 b' class requestcontext(object):'
         # some functions for the templater
 
         def motd(**map):
-            yield self.config('web', 'motd', '')
+            yield self.config('web', 'motd')
 
         # figure out which style to use
 

mercurial/hgweb/hgwebdir_mod.py

@@ -491,7 +491,7 b' class hgwebdir(object):'
             if self.motd is not None:
                 yield self.motd
             else:
-                yield config('web', 'motd', '')
+                yield config('web', 'motd')
 
         def config(section, name, default=uimod._unset, untrusted=True):
             return self.ui.config(section, name, default, untrusted)