应收总额为空不能开票

src/views/receivable/documentary/ticket.vue

@@ -58,8 +58,8 @@
     </el-table>
     <div class="footer">
       <el-button plain @click="router.back()">取消</el-button>
-      <el-button plain type="primary" @click="handleTicket(true)">开票并结算</el-button>
-      <el-button type="primary" @click="handleTicket(false)">开票</el-button>
+      <el-button plain type="primary" :disabled="selectedList.some(item => item.receivablePremium <= 0)" @click="handleTicket(true)">开票并结算</el-button>
+      <el-button type="primary" :disabled="selectedList.some(item => item.receivablePremium <= 0)" @click="handleTicket(false)">开票</el-button>
     </div>
     <el-dialog :close-on-click-modal="false" v-model="countShow" width="600" :title="isSettlement ? '开票并结算' : '开票'">
       <el-form ref="CountForm" :model="countForm" :rules="countRules" label-width="120">