Promise<Observable> will swallow errors in ServerNsq

[jiangmengyu0409]

@superbogy @xavierchow The following handler method will return a Promise<Observable<any>> type, which will swallow error messages returned from the inner Observable.

nestjs-nsq-transporter/src/responder/server-nsq.ts

Line 119 in 1edbfd8

await handler(packet.data, nsqCtx);