slapos_jio: Allow ERP5 mantainers extend attention point with custom script

   A general warning can be issued to warn all users regardless the context. This is usefull for general mantainence or custom messages, while it is urgent inform users right the way.

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

@@ -58,4 +58,7 @@ if portal_type in ["Hosting Subscription Module", "Hosting Subscription", "Perso
         "Your Contract is Deactivated")
     attention_point_list.append({"text": msg, 'page': "slap_request_contract_activation"})
 
+if getattr(context, "Base_getCriticalAttentionPointList", None):
+  attention_point_list.extend(context.Base_getCriticalAttentionPointList())
+
 return dumps(attention_point_list)