dede判断字段是否为空

说明：

判断是否有下载链接和判断是否有官网链接，如果没有就显示不同的图标和不能点击跳转。

代码：

<div class="btn-group btn-group-justified m-b {dede:field.baiduyun runphp='yes'}if(@me ==''){@me='normal-cursor';}else{@me='';}{/dede:field.baiduyun}">              <a href="{dede:field.baiduyun/}" class="btn btn-success btn-rounded">                <i class="{dede:field.baiduyun runphp='yes'}if(@me ==''){@me='fa fa-times';}else{@me='icon-cloud-download';}{/dede:field.baiduyun}"></i> 百度云              </a>              <a {dede:field.guanwang runphp='yes'}if(@me ==''){@me='';}else{@me='"href=/"'@me'/"';}{/dede:field.guanwang} class="btn btn-dark btn-rounded {dede:field.guanwang runphp='yes'}if(@me ==''){@me='normal-cursor';}else{@me='';}{/dede:field.guanwang}">                <i class="{dede:field.guanwang runphp='yes'}if(@me ==''){@me='fa fa-eye-slash';}else{@me='fa fa-eye';}{/dede:field.guanwang}"></i> 官网/Store              </a>            </div>主要代码是：
{dede:field.baiduyun runphp='yes'}if(@me ==''){@me='normal-cursor';}else{@me='';}{/dede:field.baiduyun}