Fix ERP5 per-module stats.

JSON only supports strings as object "keys", so true/false become
"true"/"false".

apachedex/__init__.py

@@ -553,7 +553,7 @@ class ERP5SiteStats(GenericSiteStats):
     for module_id, module_dict_state in state['module'].iteritems():
       module_dict = result.module[module_id]
       for is_document, date_dict_state in module_dict_state.iteritems():
-        date_dict = module_dict[is_document]
+        date_dict = module_dict[is_document == 'true']
         for date, apdex_state in date_dict_state.iteritems():
           date_dict[date] = APDEXStats.fromJSONState(apdex_state, getDuration)
     no_module = result.no_module