fix unhandled rejection on set cache exception

[maormoshe]

When using an async cache and the 'set' operation throws an error we get "unhandled rejection".

` import { AsyncCache, memoizeAsync } from 'utils-decorators';

class DistributedCache<T = any> implements AsyncCache { private cache = {};

async set(key: string, value: T): Promise { return new Promise((resolve, reject) => { setTimeout(() => { reject('set cache value failed.'); }, 1000); }); }

async get(key: string): Promise { return await this.cache[key]; }

async delete(key: string): Promise { delete this.cache[key]; }

async has(key: string): Promise { const val = await this.get(key);

return (val ?? null) !== null;

} }

class Test { @memoizeAsync({ cache: new DistributedCache(), }) getRand(): Promise { return new Promise((resolve) => { setTimeout(() => { resolve(Math.floor(Math.random() * 1000)); }, 1000); }); } }

const test = new Test();

test .getRand() .then((res) => console.log(result: ${res})) .catch((err) => console.log(error: ${err})); `

console output before the fix:

result: 549 [UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "set cache value failed.".] { code: 'ERR_UNHANDLED_REJECTION' }

console output after the fix:

error: set cache value failed.