阶梯价为空兼容

src/views/ecw/productPrice/index.vue

@@ -139,7 +139,7 @@
 
       <el-table-column prop="price" :label="$t('价格')" align="center">
           <template slot-scope="scope">
-            <template v-if="scope.row.stepPrice == 1">
+            <template v-if="scope.row.stepPrice == 1 && scope.row.priceStepList && scope.row.priceStepList.length">
               {{$t("第{no}阶梯（{start}~{end}{weightUnit}）", {
                 no: 1,
                 start: scope.row.priceStepList[0].startNum,
@@ -171,6 +171,9 @@
               </div>
               <el-button type="text" @click="showMoreStepPriceItem=scope.row">{{$t('查看更多')}}</el-button>
             </template>
+            <template v-else-if="scope.row.stepPrice">
+              {{$t('缺少阶梯价格设置')}}
+            </template>
             <template v-else>
               <div v-if="scope.row.priceType == 0">
                 {{$t('运费')}}:{{ getCurrencySymbol(scope.row.transportPriceUnit) + scope.row.transportPrice}}&nbsp;