update

cooleshow-user/user-admin/src/main/java/com/yonge/cooleshow/admin/controller/SubjectController.java

@@ -43,6 +43,10 @@ public class SubjectController extends BaseController {
 	@PreAuthorize("@pcs.hasPermissions('subject/queryPage')")
 	public HttpResponseResult<PageInfo<Subject>> queryPage(SubjectQueryInfo queryInfo) {
 		PageInfo<Subject> pageInfo = subjectService.queryPage(queryInfo);
+		
+		if(pageInfo.getRows().size() == 0){
+			return succeed(pageInfo);
+		}
 
 		Map<Long, Subject> map = subjectService.findBySubjectByIdList(pageInfo.getRows().stream().map(t -> t.getParentSubjectId()).collect(Collectors.toList())).stream()
 				.collect(Collectors.toMap(Subject::getId, t -> t));