fix: report list refresh

pages/reports/reports.vue

 <template>
 	<view>
-		<u-waterfall v-model="reportList">
+		<u-waterfall v-model="reportList" v-if="reportList.length > 0">
 			<template v-slot:left="{leftList}">
 				<view class="water-list" v-for="(item, index) in leftList" :key="index" @click="onClick(item)">
 					<u-lazy-load  class="water-image" img-mode="aspectFit" threshold="-450" height="150" border-radius="10" :image="item.coverImage ? item.coverImage : item.previewImg" :index="index"></u-lazy-load>
@@ -74,6 +74,8 @@
 			}
 		},
 		onPullDownRefresh() {
+			this.reportList = []
+			this.params.pageNumber = 1
 			this.getReportList()
 		},