message: Fix SA filter.
diff: import { AssignedSiteAreasDynamicAuthorizationDataSourceData, DynamicAuthorizationDataSourceName } from '../../types/Authorization';
  -import Authorizations from '../Authorizations';
  import Constants from '../../utils/Constants';
  import DynamicAuthorizationDataSource from '../DynamicAuthorizationDataSource';
  import SiteAreaStorage from '../../storage/mongodb/SiteAreaStorage';
  import SiteStorage from '../../storage/mongodb/SiteStorage';
  +import Utils from '../../utils/Utils';
  import _ from 'lodash';
  export default class AssignedSiteAreasDynamicAuthorizationDataSource
  @@ -32,7 +32,7 @@ export default class AssignedSiteAreasDynamicAuthorizationDataSource
  ['id']
  );
  const siteIDs = _.uniq(_.map(sites.result, 'id'));
  - if (siteIDs.length !== 0) {
  + if (!Utils.isEmptyArray(siteIDs)) {
  const siteAreas = await SiteAreaStorage.getSiteAreas(this.tenant.id,
  {
  siteIDs: siteIDs,
  @@ -42,6 +42,6 @@ export default class AssignedSiteAreasDynamicAuthorizationDataSource
  );
  return _.uniq(_.map(siteAreas.result, 'id'));
  }
  - return [null];
  + return [];
  }
  }
  