avoid traceback when stat file doesn't exist

utils.py

@@ -105,6 +105,8 @@ def extract_stats_dict(awstats_dir, filename):
         }
     }
     '''
+    if not osp.isfile(osp.join(awstats_dir, filename)):
+        return {}
     section_name = None
     parsed_countdown = 0
     stats_dict = {}