number 1:

currently we cannot set [] for a domain in hosts.(the code return error)

but we may want to return no IP (EmptyResponse) for a domain, for example return no IP for ads-domains to block them:

"dns":{
    "hosts": {
      "geosite:category-ads-all": []
    }
}

so i extend ability to set [] or "" for a domain when we want no IP to return for a domain (EmptyResponse)

number 2:

suppose we want to return "216.239.38.120" for "youtube.com" but return "216.239.38.119" for other google sites, so we set:

"dns":{
    "hosts": {
      "youtube.com": ["216.239.38.120"],
      "geosite:google": ["216.239.38.119"]
    }
}

But the code accumulates the results, and we will eventually have:

"youtube.com": ["216.239.38.120","216.239.38.119"]

so we don't get the desired result.

so we should not accumulate matched-results, We should return the first matched-result.

because each matched-result can have multiple IPs, so there is no need to accumulate the matched-results.

and accumulating the matched-results only causes such problems.

as a result, now, the first matched-result is returned for a domain in hosts, Instead of accumulating all the matched-results.