[resty.resolver] handle invalid resolver #730
Merged
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.resolver
would benil
https://github.com/3scale/apicast/blob/12bc55ec6f6d7c6e0c10d2ed718c892ff37416b5/gateway/src/resty/resolver/dns_client.lua#L65
and produce a crash:
https://github.com/3scale/apicast/blob/12bc55ec6f6d7c6e0c10d2ed718c892ff37416b5/gateway/src/resty/resolver/dns_client.lua#L56-L59