feat: simplify code to get optional data

program/services.py

@@ -176,8 +176,6 @@ def resolve_conflicts(data: ScheduleCreateUpdateData, schedule_pk: int | None, s
             errors[timeslot["hash"]] = _("Given solution is not accepted for this conflict.")
             continue
 
-        """Conflict resolution"""
-
         existing = timeslot["collisions"][0]
         solution = solutions[timeslot["hash"]]
 
@@ -374,24 +372,22 @@ def instantiate_upcoming_schedule(
     rrule = RRule.objects.get(pk=data["rrule_id"])
     show = Show.objects.get(pk=show_pk)
 
-    is_repetition = data["is_repetition"] if "is_repetition" in data else False
+    is_repetition = data.get("is_repetition", False)
 
-    # default is `False`
-    add_business_days_only = (
-        data["add_business_days_only"] if "add_business_days_only" in data else False
-    )
+    add_business_days_only = data.get("add_business_days_only", False)
 
     # default is `None`
     add_days_no = data.get("add_days_no")
     by_weekday = data.get("by_weekday")
     default_playlist_id = data.get("default_playlist_id")
 
+    # required
     first_date = parse_date(data["first_date"])
     start_time = parse_time(data["start_time"])
     end_time = parse_time(data["end_time"])
 
-    # last_date may not be present in data
-    last_date = parse_date(data["last_date"]) if data.get("last_date") is not None else None
+    # last_date may not be present in data, parse_date returns `None` in this case
+    last_date = parse_date(data.get("last_date"))
 
     return Schedule(
         pk=pk,