fix: 提示教材没有时选择教材;

src/renderer/src/views/prepare/container/reserv.vue

@@ -270,6 +270,11 @@ const updateClassReserv = (formData) => {
 }
 const addClassReserv = (formData) => {
   let ids = formData.resource.join(',')
+  // 判断是否添加教材
+  if(!props.bookId){
+    ElMessage.warning('请选择教材')
+    return
+  }
   let param = {
     className: formData.name,
     classType: formData.type,