<label>内有内容时显示上方标题,无内容时不显示标题，谢谢大家跪求

Question

产品信息

      <div class="mui-card" style="margin-bottom: 15px;">
          <ul class="mui-table-view">
            <li class="mui-table-view-cell">
              <label class="text_title" >产品名称：</label>
              <label><?php echo $pro_name;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">登记证号：</label>
              <label><?php echo $djzh;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">类别：</label>
              <label><?php echo $nylb;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">公司名：</label>
              <label><?php echo $jhl;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">生产日期：</label>
              <label><?php echo $zyxcfhl;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">剂型：</label>
              <label><?php echo $jx;?></label>
            </li>
          <!--  <li class="mui-table-view-cell">
              <label class="text_title">毒性：</label>
              <label><?php echo $dx;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">生产日期：</label>
              <label><?php echo $adddate;?></label>
            </li>-->
            <li class="mui-table-view-cell">
              <label class="text_title">批号：</label>
              <label><?php echo $riqi;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">有效期：</label>
              <label><?php echo $bzq;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">生产厂家：</label>
              <label><?php echo $djzcyr;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">生产许可证（或生产批准文件）号：</label>
              <label><?php echo $xkzh;?></label>
            </li>
            <li class="mui-table-view-cell">
              <label class="text_title">产品标准号：</label>
              <label><?php echo $bzzh;?></label>
            </li>
          </ul>
        </div>

Answer 1

不能判断label是否为空？