add cfgimpl_get_children for MetaConfig and informations

tiramisu/config.py

@@ -508,6 +508,10 @@ class MetaConfig(ConfigCommon):
         self._impl_settings = Setting(self)
         self._impl_values = Values(self)
         self._impl_meta = None
+        self._impl_informations = {}
+
+    def cfgimpl_get_children(self):
+        return self._impl_children
 
     def cfgimpl_get_context(self):
         "a meta config is a config wich has a setting, that is itself"