{if condition="$list"}
{foreach name="list" item="v"}
<div class="Column-stage bt_line">
<div class="Column m5"><a href="{:url('article/lists',array('cid'=>$v.id))}">{$v.name}</a></div>
<div class="seemore"><a href="{:url('article/lists',array('cid'=>$v.id))}" title="查看更多" target="_blank"> <span class="seemore-txt">SEE MORE</span> <i class="seemore-i"><dfn></dfn></i> </a></div>
</div>
<div class="m-bd">
<ul class="M-photos-list">
{if condition="$v"}
{foreach name="v['article']" item="a"}
<li>
<a href="{:url('article/content',array('id'=>$a.id))}"> <img src="{$a.photo}" alt="{$a.title}">
<div class="info-box">
<div class="photos-txt clearfix">
<h4>{$a.title}</h4>
<span class="browse">See:{$a.views}</span> </div>
<div class="photos-pt clearfix"> <i></i> <span>POST TIME: {$a.create_time|date="Y-m-d",###}</span> </div>
</div>
<div class="photos-shade"> <span></span>
<h4>{$a.title}</h4>
</div>
</a>
</li>
{/foreach}
{/if}


这段代码是循环几个栏目下的文章，经过测试如果有一个栏目下有文章，不会报错，但是几个栏目下文章都为空时，错误->未定义数组索引: article
哪位大神帮忙分析下