hgweb: use try/except/finally

mercurial/hgweb/hgwebdir_mod.py

@@ -176,7 +176,6 b' class hgwebdir(object):'
 
     def run_wsgi(self, req):
         try:
-            try:
                 self.refresh()
 
                 virtual = req.env.get("PATH_INFO", "").strip('/')