fix(消息通知): 修复删除缺陷没有通知的问题

--bug=1018817 --user=刘瑞斌 【项目设置】缺陷消息通知：删除事件的消息都收不到通知（站内信、邮件、机器人） https://www.tapd.cn/55049933/s/1276361

test-track/backend/src/main/java/io/metersphere/controller/IssuesController.java

@@ -116,7 +116,7 @@ public class IssuesController {
 
     @GetMapping("/delete/{id}")
     @MsAuditLog(module = OperLogModule.TRACK_BUG, type = OperLogConstants.DELETE, beforeEvent = "#msClass.getLogDetails(#id)", msClass = IssuesService.class)
-    @SendNotice(taskType = NoticeConstants.TaskType.DEFECT_TASK, target = "#targetClass.get(#id)", targetClass = IssuesService.class, event = NoticeConstants.Event.DELETE, subject = "缺陷通知")
+    @SendNotice(taskType = NoticeConstants.TaskType.DEFECT_TASK, target = "#targetClass.getIssue(#id)", targetClass = IssuesService.class, event = NoticeConstants.Event.DELETE, subject = "缺陷通知")
     public void delete(@PathVariable String id) {
         issuesService.delete(id);
     }

test-track/backend/src/main/java/io/metersphere/service/IssuesService.java

@@ -308,6 +308,9 @@ public class IssuesService {
 
     public IssuesWithBLOBs getIssue(String id) {
         IssuesDao issuesWithBLOBs = extIssuesMapper.selectByPrimaryKey(id);
+        if (issuesWithBLOBs == null) {
+            return null;
+        }
         IssuesRequest issuesRequest = new IssuesRequest();
         Project project = baseProjectService.getProjectById(issuesWithBLOBs.getProjectId());
         issuesRequest.setWorkspaceId(project.getWorkspaceId());