Don't pork up if UD is down

modules/link/link.js

@@ -55,12 +55,14 @@ var link = function(dbot) {
 	    	var query = event.input[1];
             var reqUrl = 'http://api.urbandictionary.com/v0/define?term=' + encodeURI(query); 
             request(reqUrl, function(error, response, body) {
+            	try {
 	                var result = JSON.parse(body);
 	                if(_.has(result, 'result_type') && result.result_type != 'no_results') {
 	                    event.reply(query + ': ' + result.list[0].definition.split('\n')[0]);
 	                } else {
 	                    event.reply(event.user + ': No definition found.');
 	                }
+            	} catch(err) { }
             });
         }
     };