fixing exceptions for tests

Selector.Tests/Helper.cs

@@ -140,7 +140,12 @@ namespace Selector.Tests
             {
                 Name = name,
                 Id = id ?? name,
-                SnapshotId = snapshotId ?? id ?? name
+                SnapshotId = snapshotId ?? id ?? name,
+                Tracks = new()
+                {
+                    Items = new List<PlaylistTrack<IPlayableItem>>(),
+                    Total = 0
+                }
             };
         }
     }

Selector/Watcher/PlaylistWatcher.cs

@@ -139,7 +139,7 @@ namespace Selector
 
         private async Task PageLiveTracks()
         {
-            if (config.PullTracks)
+            if (config.PullTracks && Live.Tracks.Items.Count > 0)
             {
                 Logger.LogDebug("Paging current tracks");