添加销售类型默认值

src/views/supply/policy/components/retail_form.vue

@@ -446,6 +446,8 @@
                   :disabled="disabled"
                   style="width: 100%"
                 >
+                <el-option label="默认" :value="''"></el-option>
+
                   <el-option
                     v-for="(item, index) in policyList"
                     :key="index"