Fix a bug with services that have no endpoints

brian_dashboard_manager/templating/helpers.py

@@ -107,6 +107,8 @@ def get_nren_interface_data(services, interfaces, excluded_dashboards):
             lag_service = service['service_type'] == 'ETHERNET'
 
             if lag_service:
+                if len(_interfaces) == 0:
+                    continue
                 if len(_interfaces) > 1:
                     logger.info(
                         f'{sid} {name} aggregate service has > 1 interface')