fix(base) avoid a crash when self.lastQuery is not set

Kong / lua-resty-dns-client

Lua DNS client, load balancer, and utility library

http://kong.github.io/lua-resty-dns-client/topics/README.md.html

Apache License 2.0

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fix(base) avoid a crash when self.lastQuery is not set #82

Closed hishamhm closed 4 years ago

hishamhm commented 4 years ago

I cannot reproduce this easily, but I've had a crash in the logs caused by attempting to dereference self.lastQuery.expire when self.lastQuery was nil.

Patched it like this to match the coding style present in this module.