fix smart_collection search crashes

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix remote stream scripts (parsing issue with spaces and quotes)
 - Fix block history being removed when it is still needed for mirror channel
   - This caused playout build errors like "Unable to locate history for playout item"
+- Fix crashes due to invalid smart collection searches, e.g. `smart_collection:"this collection does not exist"`
 
 ## [25.8.0] - 2025-10-26
 ### Added

ErsatzTV.Core/Scheduling/ChronologicalMediaCollectionEnumerator.cs

@@ -45,8 +45,13 @@ public sealed class ChronologicalMediaCollectionEnumerator : IMediaCollectionEnu
     public Option<MediaItem> Current => _sortedMediaItems.Count != 0 ? _sortedMediaItems[State.Index] : None;
     public Option<bool> CurrentIncludeInProgramGuide { get; }
 
-    public void MoveNext(Option<DateTimeOffset> scheduledAt) =>
-        State.Index = (State.Index + 1) % _sortedMediaItems.Count;
+    public void MoveNext(Option<DateTimeOffset> scheduledAt)
+    {
+        if (_sortedMediaItems.Count > 0)
+        {
+            State.Index = (State.Index + 1) % _sortedMediaItems.Count;
+        }
+    }
 
     public Option<TimeSpan> MinimumDuration => _lazyMinimumDuration.Value;
 

ErsatzTV.Infrastructure/Search/SearchQueryParser.cs

@@ -77,7 +77,8 @@ public partial class SearchQueryParser(ISmartCollectionCache smartCollectionCach
                 if (parsedQuery == replaceResult.Query)
                 {
                     logger.LogWarning(
-                        "Failed to replace smart_collection in query; is the syntax correct? Quotes are required. Giving up...");
+                        "Failed to replace smart_collection in query; is the syntax correct? Quotes are required. Giving up on collection {Name}...",
+                        smartCollectionName);
                     break;
                 }
 
@@ -125,6 +126,12 @@ public partial class SearchQueryParser(ISmartCollectionCache smartCollectionCach
                 {
                     result = result.Replace(match.Value, $"({smartCollectionQuery})");
                 }
+
+                if (maybeQuery.IsNone)
+                {
+                    //logger.LogError("Cannot find nested smart collection {Name}; removing from query.", smartCollectionName);
+                    result = result.Replace(match.Value, "(type:bad_query)");
+                }
             }
 
             return new ReplaceResult(result, false);

ErsatzTV/Pages/Playouts.razor

@@ -366,7 +366,7 @@
             ? playout.PlayoutId
             : null;
 
-        _buildMessage = !playout.BuildStatus.Success && !string.IsNullOrWhiteSpace(playout.BuildStatus.Message)
+        _buildMessage = !(playout.BuildStatus?.Success ?? false) && !string.IsNullOrWhiteSpace(playout.BuildStatus?.Message)
             ? playout.BuildStatus.Message
             : string.Empty;