set task_eager_propagates to True

this is necessary, otherwise the synchronise tasks called with
.apply() fail silently

inventory_provider/tasks/config.py

@@ -6,3 +6,4 @@ broker_url = getenv(
 result_backend = getenv(
     'CELERY_BROKER_URL',
     default='redis://test-dashboard02.geant.org:6379/1')
+task_eager_propagates = True
\ No newline at end of file