Merge pull request #11853 from dataease/pr@dev-v2@refactor_export-empty

refactor(仪表板、数据大屏): 图表导出增加空数据提示

core/core-frontend/src/components/visualization/UserViewEnlarge.vue

@@ -308,6 +308,10 @@ const downloadViewImage = () => {
 
 const downloadViewDetails = (downloadType = 'view') => {
   const viewDataInfo = dvMainStore.getViewDataDetails(viewInfo.value.id)
+  if (!viewDataInfo) {
+    ElMessage.error('当前无数据，无法导出')
+    return
+  }
   const chartExtRequest = dvMainStore.getLastViewRequestInfo(viewInfo.value.id)
   const chart = {
     ...viewInfo.value,