slapos_jio: Except on TypeError as memcache cannot receive None as Key

master/bt5/slapos_jio/SkinTemplateItem/portal_skins/slapos_hal_json_style/Base_getNewsDict.py

@@ -6,7 +6,7 @@ memcached_dict = context.getPortalObject().portal_memcached.getMemcachedDict(
   plugin_path='portal_memcached/default_memcached_plugin')
 try:
   d = memcached_dict[document.getReference()]
-except KeyError:
+except (KeyError, TypeError):
   d = {
     "user": "SlapOS Master",
     "text": "#error no data found for %s" % document.getReference(),