同步组织架构时候，若父部门不可见，那么将parentId设置为空串

src/main/java/com/tanpu/feo/feojob/jobs/OrgSyncByWxcpJob.java

@@ -312,7 +312,7 @@ public class OrgSyncByWxcpJob {
             }
             //更新
             Long parentId1 = wxCpDepartDto.getParentId();
-            String parentId = ObjectUtil.isNull(hashMap2.get(parentId1)) ? null : orgId + "_" + parentId1;
+            String parentId = ObjectUtil.isNull(hashMap2.get(parentId1)) ? "" : orgId + "_" + parentId1;
             Integer level = getLevel(hashMap2, wxCpDepartDto.getId());
             if (!department.getDepartmentName().equals(wxCpDepartDto.getName()) || StrUtil.compareIgnoreCase(department.getParentDepartId(), parentId, false) != 0
                     || !department.getMembers().equals(wxCpDepartDto.getMembers()) || !level.equals(department.getLevel())) {
@@ -328,7 +328,7 @@ public class OrgSyncByWxcpJob {
         for (String departmentId : hashMap.keySet()) {
             WxCpDepartDto wxCpDepartDto = hashMap.get(departmentId);
             Long parentId1 = wxCpDepartDto.getParentId();
-            String parentId = ObjectUtil.isNull(hashMap2.get(parentId1)) ? null : orgId + "_" + parentId1;
+            String parentId = ObjectUtil.isNull(hashMap2.get(parentId1)) ? "" : orgId + "_" + parentId1;
             DepartmentEntity department = new DepartmentEntity();
             department.setDepartmentId(orgId + "_" + wxCpDepartDto.getId());
             department.setParentDepartId(parentId);