Handle incomplete websocket message (#413)

Sometimes the VOICE_SERVER_UPDATE packet will contain a valid guild_id
but no token/endpoint.

lib/Client/InternalClient.js

@@ -375,6 +375,7 @@ var InternalClient = (function () {
 							if (data.d.guild_id !== server.id) return; // ensure it is the right server
 							token = data.d.token;
 							endpoint = data.d.endpoint;
+							if (!token || !endpoint) return;
 							var chan = new _VoiceVoiceConnection2["default"](channel, _this5.client, session, token, server, endpoint);
 							_this5.voiceConnections.add(chan);