fix img preview

src/pages/write_off/ym_confirm/ym_confirm.vue

@@ -57,6 +57,7 @@ export default {
     },
     methods: {
         previewImg(url){
+            if(!url)return
             uni.previewImage({ urls: [ url ] });
         },
         confirmBtn: util.debounce(function(){

src/subpackage/order/pages/ym_card/detail/detail.vue

@@ -25,7 +25,13 @@
                     <block slot="name">用户昵称：</block> 
                 </a-line>
                 <view class="yu-line">照片：<text @click="changeFaceImgBtn" v-if="orderInfo.status ==1">更改照片</text></view>
-                <image class="yu-img" mode="aspectFit" :src="orderInfo.user_face"  @click="previewImg(orderInfo.user_face)"></image>
+                <image 
+                    class="yu-img" 
+                    mode="aspectFit" 
+                    v-if="orderInfo.user_face"
+                    :src="orderInfo.user_face"  
+                    @click="previewImg(orderInfo.user_face)"
+                ></image>
             </view>
 
             <view class="yci-box yci-buy-info"  v-if="orderInfo.status == 1 || orderInfo.status == 2 || orderInfo.status == 3">
@@ -89,6 +95,7 @@ export default {
     },
     methods: {
         previewImg(url){
+            if(!url)return
             uni.previewImage({ urls: [ url ] });
         },
         changeFaceImgBtn(){