Using the count instead

Author: StanleyGoldman

src/GitHub.App/ViewModels/GitHubPane/PullRequestDetailViewModel.cs

@@ -57,7 +57,7 @@ public sealed class PullRequestDetailViewModel : PanePageViewModelBase, IPullReq
         bool refreshOnActivate;
         Uri webUrl;
         IDisposable sessionSubscription;
-        IReadOnlyList<IPullRequestCheckViewModel> checks;
+        IReadOnlyList<IPullRequestCheckViewModel> checks = Array.Empty<IPullRequestCheckViewModel>();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="PullRequestDetailViewModel"/> class.
@@ -350,7 +350,7 @@ public async Task Load(PullRequestDetailModel pullRequest)
                 Body = !string.IsNullOrWhiteSpace(pullRequest.Body) ? pullRequest.Body : Resources.NoDescriptionProvidedMarkdown;
                 Reviews = PullRequestReviewSummaryViewModel.BuildByUser(Session.User, pullRequest).ToList();
 
-                Checks = PullRequestCheckViewModel.Build(viewViewModelFactory, pullRequest)?.ToList();
+                Checks = (IReadOnlyList<IPullRequestCheckViewModel>) PullRequestCheckViewModel.Build(viewViewModelFactory, pullRequest)?.ToList() ?? Array.Empty<IPullRequestCheckViewModel>();
 
                 await Files.InitializeAsync(Session);
 

src/GitHub.VisualStudio.UI/Views/GitHubPane/PullRequestDetailView.xaml

@@ -248,7 +248,8 @@
                                       HeaderText="Checks"
                                       IsExpanded="True"
                                       Margin="0 8 0 0"
-                                      ghfvs:ScrollingVerticalStackPanel.IsFixed="true">
+                                      ghfvs:ScrollingVerticalStackPanel.IsFixed="true"
+                                      Visibility="{Binding Checks.Count, Converter={ghfvs:CountToVisibilityConverter}}">
                     <ItemsControl ItemsSource="{Binding Checks}" Margin="0 4 12 4">
                         <ItemsControl.ItemsPanel>
                             <ItemsPanelTemplate>