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/silence-user.ts

@@ -24,17 +24,17 @@ export const meta = {
 	}
 };
 
-export default define(meta, (ps) => new Promise(async (res, rej) => {
+export default define(meta, async (ps) => {
 	const user = await User.findOne({
 		_id: ps.userId
 	});
 
 	if (user == null) {
-		return rej('user not found');
+		throw new Error('user not found');
 	}
 
 	if (user.isAdmin) {
-		return rej('cannot silence admin');
+		throw new Error('cannot silence admin');
 	}
 
 	await User.findOneAndUpdate({
@@ -45,5 +45,5 @@ export default define(meta, (ps) => new Promise(async (res, rej) => {
 		}
 	});
 
-	res();
-}));
+	return;
+});