fix 为空默认值

@@ -28,7 +28,7 @@
             <van-col span="12">
               <div style="font-size: 1rem; color: #999999; text-align: right;">
                 <van-icon :name="icon_video" />
-                {{ bookInfo.total }}个作品
+                {{ bookInfo.total ? bookInfo.total : 0 }}个作品
               </div>
             </van-col>
           </van-row>

@@ -4,12 +4,12 @@
       <van-row>
         <van-col span="11" class="sum">
           <p>捐赠总金额</p>
-          <p>{{ donateInfo.total }}&nbsp;元</p>
+          <p>{{ donateInfo.total ? donateInfo.total : 0 }}&nbsp;元</p>
         </van-col>
         <van-col span="1"><div class="line"></div></van-col>
         <van-col class="book" span="11">
           <p>点亮书籍</p> 
-          <p>{{ donateInfo.num }}&nbsp;个</p>
+          <p>{{ donateInfo.num ? donateInfo.num : 0 }}&nbsp;个</p>
         </van-col>
       </van-row>
     </div>