Fix exception formatiing

UrekD · UrekD · commit c85fc7b3cfab · 2023-06-28T17:48:46.000+02:00
diff --git a/src/scheduling/schedule_config.py b/src/scheduling/schedule_config.py
@@ -10,7 +10,7 @@
 def _read_datetime(incoming_schedule_config, key):
     datetime_value = model_helper.read_datetime_from_config(key, incoming_schedule_config)
     if datetime_value is None:
-        raise InvalidScheduleException('%1 is required', key)
+        raise InvalidScheduleException(f'{key} is required')
     return datetime_value
 
 def _read_repeat_unit(incoming_schedule_config):
