configitems: register the 'web.name' config

mercurial/configitems.py

@@ -730,6 +730,9 b" coreconfigitem('web', 'errorlog',"
 coreconfigitem('web', 'ipv6',
     default=False,
 )
+coreconfigitem('web', 'name',
+    default=dynamicdefault,
+)
 coreconfigitem('web', 'port',
     default=8000,
 )

mercurial/hgweb/hgweb_mod.py

@@ -191,7 +191,7 b' class requestcontext(object):'
         sessionvars = webutil.sessionvars(vars, start)
 
         if not self.reponame:
-            self.reponame = (self.config('web', 'name')
+            self.reponame = (self.config('web', 'name', '')
                              or req.env.get('REPO_NAME')
                              or req.url.strip('/') or self.repo.root)