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/federation/instances.ts

@@ -34,7 +34,7 @@ export const meta = {
 	}
 };
 
-export default define(meta, (ps, me) => new Promise(async (res, rej) => {
+export default define(meta, async (ps, me) => {
 	let sort;
 
 	if (ps.sort) {
@@ -122,5 +122,5 @@ export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 			skip: ps.offset
 		});
 
-	res(instances);
-}));
+	return instances;
+});