handles scenario where defaultschedule is nil (#8714)

packages/trpc/server/routers/viewer/availability/util.ts

@@ -27,7 +27,12 @@ export const getDefaultScheduleId = async (userId: number, prisma: PrismaClient)
     },
   });
 
-  return defaultSchedule?.id; // TODO: Handle no schedules AT ALL
+  if (!defaultSchedule) {
+    // Handle case where defaultSchedule is null by throwing an error
+    throw new Error("No schedules found for user");
+  }
+
+  return defaultSchedule.id;
 };
 
 export const hasDefaultSchedule = async (user: Partial<User>, prisma: PrismaClient) => {