fix: (notification) label

src/views/notification/list.vue

@@ -20,8 +20,10 @@
       </template>
 
       <template #periodTime="{ record }">
-        <Time :value="record.startTime" mode="datetime" /> 到
-        <Time :value="record.endTime" mode="datetime" />
+        <span v-if="record.startTime?.length && record.endTime?.length">
+          <Time :value="record.startTime" mode="datetime" /> 到
+          <Time :value="record.endTime" mode="datetime" />
+        </span>
       </template>
 
       <template #createTime="{ record }">