TMSS-1216: fixed test

SAS/TMSS/backend/test/t_subtasks.py

@@ -110,6 +110,7 @@ def create_scheduling_relation_task_blueprint_for_testing(first_task_blueprint,
     """
     task_scheduling_rel_obj = models.TaskSchedulingRelationBlueprint.objects.create(
                                  tags=[],
+                                 draft=models.TaskSchedulingRelationDraft.objects.create(first=first_task_blueprint.draft, second=second_task_blueprint.draft, placement=models.SchedulingRelationPlacement.objects.get(value=placement)),
                                  first=first_task_blueprint,
                                  second=second_task_blueprint,
                                  placement=models.SchedulingRelationPlacement.objects.get(value=placement),