Добавил обработку исключений

src/main.py

@@ -193,15 +193,16 @@ def get_slot_by_id(
         slot_id: str,
         service: Resource = Depends(get_calendar_service)
 ):
+    try:
         event_dict = service.events().get(
             calendarId=CALENDAR_ID,
             eventId=slot_id
         ).execute()
-    event = CalendarEvent(**event_dict)
-
-    if not event:
+    except Exception:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Slot not found")
 
+    event = CalendarEvent(**event_dict)
+
     return event