fix-修复了显示问题

src/views/BehaviorPage/BehaviorBoard.vue

@@ -447,6 +447,10 @@ const formatDateTime = (isoString: string): string => {
 };
 async function getVersionList(){
   versionIsLoading.value = true
+  if (!currentEngagement.value){
+    versionIsLoading.value = false
+    return
+  }
   let res = await apis.selectBehaviorRecordVersions(currentEngagement.value.studentId,currentEngagement.value.assignmentId)
   console.log('版本号',res)
   if (res && res.data && res.data.code === 200 && Array.isArray(res.data.data?.versions)){