slapos_panel: drop hardcoded url

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/Project_addSlapOSComputeNodeToken.py

@@ -2,6 +2,19 @@ portal = context.getPortalObject()
 person = portal.portal_membership.getAuthenticatedMember().getUserValue()
 
 web_site = context.getWebSiteValue()
+
+slapos_master_api = web_site.getLayoutProperty(
+    "configuration_slapos_master_api", None)
+if slapos_master_api is None:
+  return context.Base_redirect(
+    keep_items={
+      'portal_status_message': 'configuration_slapos_master_api is not configured',
+      'portal_status_level': 'error'
+    }
+  )
+
+# This url is only used to call 1 (one) python script.
+# it could be whatever url able to reach erp5
 slapos_master_web_url = web_site.getLayoutProperty(
     "configuration_slapos_master_web_url",
     default=web_site.absolute_url()
@@ -29,9 +42,6 @@ access_token = portal.access_token_module.newContent(
 access_token_id = access_token.getId()
 access_token.validate()
 
-slapos_master_api = web_site.getLayoutProperty(
-    "configuration_slapos_master_api", "https://slap.vifib.com")
-
 compute_node_install_command_line = web_site.getLayoutProperty(
   "configuration_compute_node_install_command_line",
   "wget https://deploy.erp5.net/slapos ; bash slapos")