[Fix-16680][ApiServer] Query project list paging error (#16681)

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ProjectServiceImpl.java

@@ -391,13 +391,18 @@ public class ProjectServiceImpl extends BaseServiceImpl implements ProjectServic
                 project.setPerm(Constants.DEFAULT_ADMIN_PERMISSION);
             }
         }
+        if (CollectionUtils.isEmpty(projectList)) {
+            result.setData(pageInfo);
+            putMsg(result, Status.SUCCESS);
+            return result;
+        }
         List<User> userList = userMapper.selectByIds(projectList.stream()
                 .map(Project::getUserId).distinct().collect(Collectors.toList()));
         Map<Integer, String> userMap = userList.stream().collect(Collectors.toMap(User::getId, User::getUserName));
-        List<ProjectWorkflowDefinitionCount> projectWorkflowDefinitionCountList =
-                workflowDefinitionMapper.queryProjectWorkflowDefinitionCountByProjectCodes(
-                        projectList.stream().map(Project::getCode).distinct().collect(Collectors.toList()));
-        Map<Long, Integer> projectWorkflowDefinitionCountMap = projectWorkflowDefinitionCountList.stream()
+        List<Long> projectCodes = projectList.stream().map(Project::getCode).distinct().collect(Collectors.toList());
+        Map<Long, Integer> projectWorkflowDefinitionCountMap = workflowDefinitionMapper
+                .queryProjectWorkflowDefinitionCountByProjectCodes(projectCodes)
+                .stream()
                 .collect(Collectors.toMap(ProjectWorkflowDefinitionCount::getProjectCode,
                         ProjectWorkflowDefinitionCount::getCount));
         for (Project project : projectList) {