Change GetItem to return null to handle nullable LibraryManager (#137)

ConfusedPolarBear.Plugin.IntroSkipper/Controllers/SkipIntroController.cs

@@ -154,7 +154,7 @@ public class SkipIntroController : ControllerBase
         {
             // Get the details of the item from Jellyfin
             var rawItem = Plugin.Instance.GetItem(intro.Key);
-            if (rawItem is not Episode episode)
+            if (rawItem == null || rawItem is not Episode episode)
             {
                 throw new InvalidCastException("Unable to cast item id " + intro.Key + " to an Episode");
             }

ConfusedPolarBear.Plugin.IntroSkipper/Controllers/VisualizationController.cs

@@ -140,6 +140,7 @@ public class VisualizationController : ControllerBase
         foreach (var e in episodes)
         {
             Plugin.Instance!.Intros.Remove(e.EpisodeId);
+            Plugin.Instance!.Credits.Remove(e.EpisodeId);
         }
 
         Plugin.Instance!.SaveTimestamps();

ConfusedPolarBear.Plugin.IntroSkipper/Plugin.cs

@@ -351,7 +351,7 @@ public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
         return commit;
     }
 
-    internal BaseItem GetItem(Guid id)
+    internal BaseItem? GetItem(Guid id)
     {
         return _libraryManager.GetItemById(id);
     }
@@ -363,7 +363,15 @@ public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
     /// <returns>Full path to item.</returns>
     internal string GetItemPath(Guid id)
     {
-        return GetItem(id).Path;
+        var item = GetItem(id);
+        if (item == null)
+        {
+            // Handle the case where the item is not found
+            _logger.LogWarning("Item with ID {Id} not found.", id);
+            return string.Empty;
+        }
+
+        return item.Path;
     }
 
     /// <summary>
@@ -373,7 +381,15 @@ public class Plugin : BasePlugin<PluginConfiguration>, IHasWebPages
     /// <returns>List of chapters.</returns>
     internal List<ChapterInfo> GetChapters(Guid id)
     {
-        return _itemRepository.GetChapters(GetItem(id));
+        var item = GetItem(id);
+        if (item == null)
+        {
+            // Handle the case where the item is not found
+            _logger.LogWarning("Item with ID {Id} not found.", id);
+            return new List<ChapterInfo>();
+        }
+
+        return _itemRepository.GetChapters(item);
     }
 
     internal void UpdateTimestamps(Dictionary<Guid, Intro> newTimestamps, AnalysisMode mode)

ConfusedPolarBear.Plugin.IntroSkipper/QueueManager.cs

@@ -63,7 +63,15 @@ public class QueueManager
             {
                 foreach (var location in folder.Locations)
                 {
-                    QueueLibraryContents(_libraryManager.FindByPath(location, true).Id);
+                    var item = _libraryManager.FindByPath(location, true);
+
+                    if (item is null)
+                    {
+                        _logger.LogWarning("Unable to find linked item at path {0}", location);
+                        continue;
+                    }
+
+                    QueueLibraryContents(item.Id);
                 }
             }
             catch (Exception ex)