server: prevent getaddrinfo crash.

When there is no internet connection and the client tries to connect to
server, it throws a getaddrinfo error.

Error: getaddrinfo ENOTFOUND www.tmijs.org
at errnoException (dns.js:44:10)
at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:94:26)

lib/server.js

@@ -27,28 +27,32 @@ function getRandomServer(serverType, callback) {
 
 // Update the server list using our API with CORS support..
 function updateServers(callback) {
-    http.get({
+    var req = http.get({
         host: "www.tmijs.org",
         path: "/api/servers/",
         withCredentials: false,
         protocol:"http:"
     }, function(res) {
         var body = "";
-        res.on('data', function(buffer) {
+        res.on("data", function(buffer) {
             body += buffer;
         });
-        res.on('end', function() {
+        res.on("end", function() {
             if (res.statusCode === 200) {
                 chat_servers = JSON.parse(body)["chat_servers"];
                 event_servers = JSON.parse(body)["event_servers"];
                 group_servers = JSON.parse(body)["group_servers"];
             }
             return callback(null);
         });
-        res.on('error', function() {
+        res.on("error", function() {
             return callback(null);
         });
     });
+
+    req.on("error", function() {
+        return callback(null);
+    });
 }
 
 // Detects if the server is accepting WebSocket connections..