Only show live services without an organisation

In reality we shouldn’t have any live services that don’t have an
organisation. But we probably do locally, in preview, etc., and we
shouldn’t lose a way of accessing them.

app/models/user.py

@@ -268,6 +268,13 @@ class User(JSONModel, UserMixin):
             if not service['restricted']
         ]
 
+    @property
+    def live_services_not_belonging_to_users_organisations(self):
+        return [
+            service for service in self.orgs_and_services['services_without_organisations']
+            if not service['restricted']
+        ]
+
     @property
     def organisations(self):
         return [