Merge pull request 'fix: 解决空数据的判断;' (#227) from yangws into main

Reviewed-on: #227

src/renderer/src/components/choose-textbook/third.vue

@@ -64,6 +64,8 @@ const getVertion = (data) => {
       childs: []
     }
   })
+  //判断是否存在该教材，有则展示第一项
+  if(treeData.value.length === 0) return
   nextTick(() => {
     defaultExpandedKeys.value = [treeData.value[0].id]
     node.currentNode.data = treeData.value[0]