fix: raise an exception if Radio Settings are not found

program/services.py

@@ -24,7 +24,7 @@ from typing import Literal, TypedDict
 
 from dateutil.relativedelta import relativedelta
 from dateutil.rrule import rrule
-from rest_framework.exceptions import ValidationError
+from rest_framework.exceptions import NotFound, ValidationError
 
 from django.conf import settings
 from django.core.exceptions import ObjectDoesNotExist
@@ -816,13 +816,16 @@ def make_timeslot_entry(*, timeslot: TimeSlot) -> TimeslotEntry:
 def make_virtual_timeslot_entry(*, gap_start: datetime, gap_end: datetime) -> VirtualTimeslotEntry:
     """returns a virtual timeslot entry to fill the gap in between `gap_start` and `gap_end`."""
 
-    return {
-        "end": gap_end.strftime("%Y-%m-%dT%H:%M:%S %z"),
-        "is_virtual": True,
-        "show_id": RadioSettings.objects.first().fallback_show.id,
-        "show_name": RadioSettings.objects.first().fallback_default_pool,
-        "start": gap_start.strftime("%Y-%m-%dT%H:%M:%S %z"),
-    }
+    if radio_settings := RadioSettings.objects.first():
+        return {
+            "end": gap_end.strftime("%Y-%m-%dT%H:%M:%S %z"),
+            "is_virtual": True,
+            "show_id": radio_settings.fallback_show.id,
+            "show_name": radio_settings.fallback_default_pool,
+            "start": gap_start.strftime("%Y-%m-%dT%H:%M:%S %z"),
+        }
+    else:
+        raise NotFound("Radio settings with fallbacks not found.")
 
 
 def get_timerange_timeslot_entries(