added check for twitter container in twitter.js

source/javascripts/twitter.js

@@ -67,8 +67,10 @@ function prettyDate(time){
 }
 
 function getTwitterStatus(twitter_name){
+  var container = $(twitter_container);
+  if(!container) return;
   var tweet_cookie = 'tweets_by_' + twitter_name + tweet_count;
-  $(twitter_container).set('html', 'Fetching tweets...');
+  container.set('html', 'Fetching tweets...');
   if(!Cookie.read(tweet_cookie)) {
   	var myTwitterGitter = new TwitterGitter(twitter_name,{
   	  count: ((show_replies) ? tweet_count : 15 + tweet_count),