修复账单显示细节，调整凭证显示

application/em/model/EmInvoice.php

@@ -108,7 +108,6 @@ class EmInvoice extends Base
             if($receipt) $useage['photo'] = $receipt;
         } else {
             $useage['photo'] = [];
-
         }
 
         //获取电表信息

application/em/view/invoice/detail.html

@@ -118,16 +118,21 @@
                             <div class="layui-col-md5">
                                 <div class="layui-form-item">
                                     <label class="layui-form-label">
-                                        <span class="x-red">*</span>账单凭证
+                                        <span class="x-red">*</span>抄表单照片
                                     </label>
                                     <div class="layui-input-inline">
                                         <!-- <button type="button" class="layui-btn" id="up_photo">
                                             <i class="layui-icon"></i>上传
                                         </button> -->
                                         <input type="hidden" name="photo_id" value="{$inv.em.photo.id|default=''}">
-                                        <a href="{if isset($inv.em.photo.src)}{$inv.em.photo.src|default='#'}{/if}" class='layui-btn' target="_blank" >
+                                        {if $inv.em.photo.id == '' || !isset($inv.em.photo.id) }
+                                            未上传抄表照片
+                                        {else /}
+                                            <a href="{$inv.em.photo.src}" class='layui-btn' target="_blank" >
                                                 <i class="layui-icon">&#xe64a;</i>预览
                                             </a>
+                                        {/if}
+
                                     </div>
                                 </div>
                             </div>