message: Only concact LastChangedOn when possible
diff: @@ -191,7 +191,10 @@ export default class TenantStorage {
  logo: {
  $concat: [
  `${Utils.buildRestServerURL()}/v1/util/tenants/logo?ID=`,
  - { $toString: '$_id' }
  + { $toString: '$_id' },
  + {
  + $ifNull: [{ $concat: ['&LastChangedOn=', { $toString: '$lastChangedOn' }] }, ''] // Only concat 'lastChangedOn' if not null
  + }
  ]
  }
  }
  