Fix error_url_status initialisation from JSON.

apachedex/__init__.py

@@ -389,7 +389,9 @@ class GenericSiteStats(object):
     error_detail = state['error_detail']
     result = cls(state['threshold'], getDuration, suffix, error_detail)
     if error_detail:
-      result.error_url_count.update(state['error_url_count'])
+      error_url_count = result.error_url_count
+      for state_status, state_url_dict in state['error_url_count'].iteritems():
+        error_url_count[state_status].update(state_url_dict)
     for attribute_id in ('url_apdex', 'apdex'):
       attribute = getattr(result, attribute_id)
       for key, apdex_state in state[attribute_id].iteritems():