message: search-backend: handle missing type configuration in AuthorizedSearchEngine
  The search-backend router ensures that all requested types are
  configured, but since we don't know how this search engine will
  be used, it's good to properly handle the case where an
  unconfigured type is supplied.
diff: @@ -90,13 +90,13 @@ export class AuthorizedSearchEngine implements SearchEngine {
  const authorizer = new DataLoader((requests: readonly AuthorizeQuery[]) =>
  this.permissions.authorize(requests.slice(), options),
  );
  -
  const requestedTypes = query.types || Object.keys(this.types);
  +
  const typeDecisions = zipObject(
  requestedTypes,
  await Promise.all(
  requestedTypes.map(type => {
  - const permission = this.types[type].visibilityPermission;
  + const permission = this.types[type]?.visibilityPermission;
  return permission
  ? authorizer.load({ permission })
  @@ -162,7 +162,7 @@ export class AuthorizedSearchEngine implements SearchEngine {
  return result;
  }
  - const permission = this.types[result.type].visibilityPermission;
  + const permission = this.types[result.type]?.visibilityPermission;
  const resourceRef = result.document.authorization?.resourceRef;
  if (!permission || !resourceRef) {
  