Throw a proper ApiError with statusCode 404 when GETting a non-existing emoji.

Closes #10332

packages/backend/src/server/api/endpoints/emoji.ts

@@ -1,6 +1,7 @@
 import { IsNull } from "typeorm";
 import { Emojis } from "@/models/index.js";
 import define from "../define.js";
+import { ApiError } from "../error.js";
 
 export const meta = {
 	tags: ["meta"],
@@ -9,6 +10,15 @@ export const meta = {
 	allowGet: true,
 	cacheSec: 3600,
 
+	errors: {
+		noSuchEmoji: {
+			message: "No such emoji.",
+			code: "NO_SUCH_EMOJI",
+			id: "6a5e3be7-5ac3-44a6-a425-9937cd66f8e1",
+			httpStatusCode: 404,
+		},
+	},
+
 	res: {
 		type: "object",
 		optional: false,
@@ -28,12 +38,16 @@ export const paramDef = {
 } as const;
 
 export default define(meta, paramDef, async (ps, me) => {
-	const emoji = await Emojis.findOneOrFail({
+	const emoji = await Emojis.findOne({
 		where: {
 			name: ps.name,
 			host: IsNull(),
 		},
 	});
 
+	if (!emoji) {
+		throw new ApiError(meta.errors.noSuchEmoji);
+	}
+
 	return Emojis.pack(emoji);
 });