修复账单显示细节，调整凭证显示

application/em/view/invoice/detail.html

@@ -125,7 +125,7 @@
                                             <i class="layui-icon"></i>上传
                                         </button> -->
                                         <input type="hidden" name="photo_id" value="{$inv.em.photo.id|default=''}">
-                                        {if $inv.em.photo.id == '' || !isset($inv.em.photo.id) }
+                                        {if !isset($inv.em.photo.id) || $inv.em.photo.id == ''}
                                             未上传抄表照片
                                         {else /}
                                             <a href="{$inv.em.photo.src}" class='layui-btn' target="_blank" >