TWCMS文章判断有评论则显示，没有评论则留空

TWCMS文章有评论则显示，没有评论则留空白，以默认主题为例，在文章模板article_show.htm找到评论模块，约在85行，修改为以下代码

{if:$gdata[comments]>0}
            {block:comment pagenum="20" firstnum="20"}
            <div class="t10" id="ctf">
                <div class="b2_tit">
                    <b>发表评论</b>
                </div>
                <div class="b2_cont comment_form cf">
                    <form id="ctf_form" action="{$tw[webdir]}index.php?u=comment-post-ajax-1" method="post">
                        <div class="ctf_cont"><textarea name="content" id="ctf_content" tabindex="1">文明上网，理性发言</textarea></div>
                        <div class="ctf_body">
                            <div class="ctf_txt" title="请填写昵称"><input name="author" id="ctf_author" type="text" value="访客" /></div>
                            <div class="ctf_sub"><input type="submit" id="ctf_submit" value="发表评论" /></div>
                            <div id="ctf_tips"></div>
                        </div>
                        <input type="hidden" name="cid" value="{$gdata[cid]}" />
                        <input type="hidden" name="id" value="{$gdata[id]}" />
                    </form>
                </div>
            </div>

            <div class="t10">
                <div class="b2_tit">
                    <a class="more" href="{$gdata[comment_url]}">更多</a>
                    <b>网友评论</b> （<font color="red">{$gdata[comments]}</font> 条评论）
                </div>
                <div id="comment_cont" class="b2_cont comment">
                    {if:empty($data[list])}
                        暂无评论
                    {else}
                    {loop:$data[list] $v $k}
                    <div class="li">
                        <div class="avatar"><img src="{$tw[tpl]}img/avatar.png" /></div>
                        <div class="post_body">
                            <div class="post_header"><b>{$v[author]} ({$v[ip]})</b> {$v[date]}</div>
                            <div class="post_message">{$v[content]}</div>
                        </div>
                    </div>
                    {/loop}
                    <a id="load_more" href="javascript:;" next_url="{$data[next_url]}" isnext="{$data[isnext]}">更多评论</a>
                    {/if}
                </div>
            </div>
            {/block}

{else} 
{/if}