有些欄目內容為空，這種情況下只顯示個標題不合適，請問怎樣過濾掉內容為空的欄目？
{php $data = get_childcat($catid);}
{loop $data $v}
<div class="yzm-content-box yzm-img-list">
<div class="yzm-title">
<h2>{$v[catname]}</h2>
<span class="yzm-title-right"><a href="{$v[pc ]}">>>更多</a></span>
</div>
<ul>
{m:lists field="title,thumb,url,color" catid="$v['catid']" limit="8"}
{loop $data $v}
<li>
<a href="{$v[url]}">
<i><img src="{get_thumb($v['thumb'])}" alt="{$v[title]}" title="{$v[title]}"></i>
<p>{title_color($v['title'], $v['color'])}</p>
</a>
</li>
{/loop}
</ul>
</div>
{/loop}
{php $data = get_childcat($catid);} {loop $data $val} {m:lists field="title,thumb,url,color" catid="$val['catid']" limit="8"} {if $data} <div class="yzm-content-box yzm-img-list"> <div class="yzm-title"> <h2>{$val[catname]}</h2> <span class="yzm-title-right"><a href="{$val[pclink]}">>>更多</a></span> </div> <ul> {loop $data $v} <li> <a href="{$v[url]}"> <i><img src="{get_thumb($v['thumb'])}" alt="{$v[title]}" title="{$v[title]}"></i> <p>{title_color($v['title'], $v['color'])}</p> </a> </li> {/loop} </ul> </div> <div class="yzm-line"></div> {/if} {/loop}