fixing motd so that it shows default motd if config is empty

src/webserver.js

@@ -114,7 +114,7 @@ var express = require('express'),
 				break;
 			case 'home' :
 					categories.getAllCategories(function(data) {
-						data.motd_class = config.show_motd ? '' : 'none';
+						data.motd_class = (config.show_motd || config.show_motd === undefined) ? '' : 'none';
 						data.motd = marked(config.motd || "# NodeBB v0.1\nWelcome to NodeBB, the discussion platform of the future.\n\n<a target=\"_blank\" href=\"http://www.nodebb.org\" class=\"btn btn-large\"><i class=\"icon-comment\"></i> Get NodeBB</a> <a target=\"_blank\" href=\"https://github.com/psychobunny/NodeBB\" class=\"btn btn-large\"><i class=\"icon-github-alt\"></i> Fork us on Github</a> <a target=\"_blank\" href=\"https://twitter.com/dcplabs\" class=\"btn btn-large\"><i class=\"icon-twitter\"></i> @dcplabs</a>");
 						res.send(JSON.stringify(data));
 					}, (req.user) ? req.user.uid : 0);