Add new posts title to the title only if there are any

boards/static/js/thread_update.js

@@ -92,19 +92,19 b' function getThreadDiff() {'
     $.getJSON(diffUrl)
         .success(function(data) {
             var addedPosts = data.added;
-            var hasMetaUpdates = false;
 
             for (var i = 0; i < addedPosts.length; i++) {
                 var postText = addedPosts[i];
                 var post = $(postText);
 
                 updatePost(post);
-                hasMetaUpdates = true;
             }
 
             var addedPostsCount = addedPosts.length;
+            if (addedPostsCount > 0) {
             updateBumplimitProgress(addedPostsCount);
             showNewPostsTitle(addedPostsCount);
+            }
 
             var updatedPosts = data.updated;
 
@@ -113,9 +113,9 b' function getThreadDiff() {'
                 var post = $(postText);
 
                 updatePost(post);
-                hasMetaUpdates = true;
             }
 
+            var hasMetaUpdates = addedPostsCount > 0 || updatedPosts.length > 0;
             if (hasMetaUpdates) {
                 updateMetadataPanel();
             }