Query object may be undefined due to Query.parse() throwing an error in lib/server.js

Hello trevoro,

Thanks for writing this library! =)

I've recently encountered an issue with the library as shown in the following error snippet:

There was a client error: ProtocolError: function () {
            return msg || name;
    }
/home/ubuntu/dnsd/node_modules/node-named/lib/server.js:87
            query.respond = function respond() {
                          ^
TypeError: Cannot set property 'respond' of undefined
    at Socket.<anonymous> (/home/ubuntu/dnsd/node_modules/node-named/lib/server.js:87:31)
    at Socket.EventEmitter.emit (events.js:98:17)
    at UDP.onMessage (dgram.js:437:8)

My assumption is that Query.parse() may have thrown an exception. It seems possible, via protocol.decode() when it encounters an invalid DNS record type.

I have implemented a possible fix on my fork; the query event will not be emitted if there is no query object returned.

Please see my pull request for details.

trevoro / node-named

Query object may be undefined due to Query.parse() throwing an error in lib/server.js #2