ignore None values in hmget() result

autovpn/acct.py

@@ -62,8 +62,10 @@ class Accounting(object):
         while True:
             try:
                 pipe.watch(aggr_key)
-                old_values = [json.loads(x) for x in pipe.hmget(aggr_key, days)]
-                old_aggr = dict(zip(days, old_values))
+                old_aggr = {}
+                for day, data in zip(days, pipe.hmget(aggr_key, days)):
+                    if data:
+                        old_aggr[day] = json.loads(data)
                 pipe.multi()
                 for day, aggr_data in aggr.iteritems():
                     old_aggr_data = old_aggr.get(day, {})