pbootcms模板文章列表没有缩略图时也不显示默认图片时怎么办？

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{pboot:list scode={sort:scode}}
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    <a href="[list:link]" rel="external nofollow"  title="[list:title]">
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    <div class="flex-column">
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        {pboot:if('[list:isico]'=='1')}
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        <img src="[list:ico]" alt="[list:title]">
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        {/pboot:if}
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        <div class="text-box">
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        <h4>[list:title]</h4>
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        <p class="intro hidden-sm">[list:content drophtml=1 dropblank=1 lencn=120]</p>
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        <p><span><i class="fa fa-clock-o" aria-hidden="true"></i> [list:date style=Y-m-d]</span><span><i class="fa fa-eye" aria-hidden="true"></i> list:visits 浏览</span><span><i class="fa fa-thumbs-up" aria-hidden="true"></i> list:likes 点赞</span></p>
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        </div>
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    </div>
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    </a>
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{/pboot:list}

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{pboot:if('list:isico'=='1')}
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        <img src="[list:ico]" alt="[list:title]">
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{/pboot:if}