message: allow for GalleryItem not existing
diff: @@ -115,7 +115,7 @@ namespace Sqlbi.Bravo.UI.Views
  options.Add(new OnlineDatasetSummary
  {
  DisplayName = dataset.Model.DisplayName,
  - Endorsement = dataset.GalleryItem.Status,
  + Endorsement = dataset?.GalleryItem?.Status ?? 0,
  Owner = $"{dataset.Model.CreatorUser.GivenName} {dataset.Model.CreatorUser.FamilyName}",
  Refreshed = dataset.Model.LastRefreshTime,
  Workspace = dataset.WorkspaceName,
  