refactor: helper function manual throw

This change is to prevent swagger to infer empty type from return type

src/utils/error.ts

@@ -1,16 +1,16 @@
 import HttpError from "../interfaces/http-error";
 import HttpStatus from "../interfaces/http-status";
 
-export function throwRelationError(name: string) {
-  throw new HttpError(
+export function relationError(name: string) {
+  return new HttpError(
     HttpStatus.BAD_REQUEST,
     `${name} cannot be found.`,
     `relation${name.replaceAll(" ", "")}NotFound`,
   );
 }
 
-export function throwNotFound(name: string) {
-  throw new HttpError(
+export function notFoundError(name: string) {
+  return new HttpError(
     HttpStatus.BAD_REQUEST,
     `${name} cannot be found.`,
     `${name.charAt(0).toLowerCase() + name.replaceAll(" ", "").slice(1)}NotFound`,