message: Add usecase - user should not be allowed to remove himself.
diff: @@ -14,6 +14,7 @@ import Site from '../../../../types/Site';
  import SiteSecurity from './security/SiteSecurity';
  import SiteStorage from '../../../../storage/mongodb/SiteStorage';
  import TenantComponents from '../../../../types/TenantComponents';
  +import { UserRole } from '../../../../types/User';
  import UserStorage from '../../../../storage/mongodb/UserStorage';
  import Utils from '../../../../utils/Utils';
  import UtilsService from './UtilsService';
  @@ -225,6 +226,16 @@ export default class SiteService {
  user: req.user
  });
  }
  + // a non-admin user should now be allowed to unassign himself
  + if (filteredRequest.userIDs.includes(req.user.id) && action !== ServerAction.ADD_USERS_TO_SITE && req.user.role !== UserRole.ADMIN) {
  + throw new AppError({
  + source: Constants.CENTRAL_SERVER,
  + errorCode: HTTPError.GENERAL_ERROR,
  + message: 'The User is not allowed to remove himself',
  + module: MODULE_NAME, method: 'handleAssignUsersToSite',
  + user: req.user
  + });
  + }
  // Check auth
  if (!Authorizations.canReadSite(req.user)) {
  throw new AppAuthError({
  