prevent crash on getRecentReplies, and styled recent replies

public/css/style.less

@@ -303,28 +303,31 @@ footer.footer {
 			line-height: 16px;
 			margin-left: 1px;
 			padding: 5px;
-
-			img {
-				display: block;
-				float: left;
-			}
-			p {
-				display: block;
-				float: left;
-				width: 70%;
-				margin-left: 10px;
-				overflow: hidden;
-				height: 32px;
-			}
-			span {
-				display: block;
-				float: left;
-				width: 70%;
-				margin-left: 10px;
-				overflow: hidden;
-				height: 16px;
-				margin-top: -10px;
-				color: #666;
+			
+			li {
+				line-height: 16px;
+				img {
+					display: block;
+					float: left;
+				}
+				p {
+					display: block;
+					float: left;
+					width: 70%;
+					margin-left: 10px;
+					overflow: hidden;
+					height: 32px;
+				}
+				span {
+					display: block;
+					float: left;
+					width: 70%;
+					margin-left: 10px;
+					overflow: hidden;
+					height: 16px;
+					margin-top: -10px;
+					color: #666;
+				}
 			}
 		}
 	}

public/templates/category.tpl

@@ -133,6 +133,10 @@
 
 	socket.emit('api:categories.getRecentReplies', cid);
 	socket.on('api:categories.getRecentReplies', function(replies) {
+		if (replies === false) {
+			return;
+		}
+		
 		var users = replies.users,
 			posts = replies.posts,
 			recent_replies = document.getElementById('category_recent_replies');

src/categories.js

@@ -262,6 +262,10 @@ var	RDB = require('./redis.js'),
 
 	Categories.getRecentReplies = function(cid, callback) {
 		RDB.zrange('categories:recent_posts:cid:' + cid, 0, -1, function(err, pids) {
+			if (pids.length == 0) {
+				callback(false);
+				return;
+			}
 			posts.getPostSummaryByPids(pids, function(posts) {
 				callback(posts);
 			});