Improve error handling of API (#4345)

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* Update attached_notes.ts

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* Refactor

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* Update call.ts

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* ✌️

* Fix

src/server/api/endpoints/admin/emoji/remove.ts

@@ -18,14 +18,14 @@ export const meta = {
 	}
 };
 
-export default define(meta, (ps) => new Promise(async (res, rej) => {
+export default define(meta, async (ps) => {
 	const emoji = await Emoji.findOne({
 		_id: ps.id
 	});
 
-	if (emoji == null) return rej('emoji not found');
+	if (emoji == null) throw new Error('emoji not found');
 
 	await Emoji.remove({ _id: emoji._id });
 
-	res();
-}));
+	return;
+});