pbootcms模板文章列表没有缩略图时也不显示默认图片

{pboot:list scode={sort:scode}} <a href="[list:link]" rel="external nofollow" title="[list:title]"> <div class="flex-column"> {pboot:if('[list:isico]'=='1')} <img src="[list:ico]" alt="[list:title]"> {/pboot:if} <div class="text-box"> <h4>[list:title]</h4> <p class="intro hidden-sm">[list:content drophtml=1 dropblank=1 lencn=120]</p> <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> </div> </div> </a>{/pboot:list}

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