Fixed: Definition not updating if local file is missing

src/NzbDrone.Core/IndexerVersions/IndexerDefinitionUpdateService.cs

@@ -281,6 +281,7 @@ namespace NzbDrone.Core.IndexerVersions
         private void UpdateLocalDefinitions()
         {
             var startupFolder = _appFolderInfo.AppDataFolder;
+            var definitionFolder = Path.Combine(startupFolder, "Definitions");
 
             var request = new HttpRequest($"https://indexers.prowlarr.com/{DEFINITION_BRANCH}/{DEFINITION_VERSION}");
             var response = _httpClient.Get<List<CardigannMetaDefinition>>(request);
@@ -291,13 +292,16 @@ namespace NzbDrone.Core.IndexerVersions
             {
                 EnsureDefinitionsFolder();
 
+                var directoryInfo = new DirectoryInfo(definitionFolder);
+                var files = directoryInfo.GetFiles($"*.yml", SearchOption.TopDirectoryOnly).Select(f => Path.GetFileNameWithoutExtension(f.Name));
+
                 foreach (var def in response.Resource)
                 {
                     try
                     {
-                        var saveFile = Path.Combine(startupFolder, "Definitions", $"{def.File}.yml");
+                        var saveFile = Path.Combine(definitionFolder, $"{def.File}.yml");
 
-                        if (currentDefs.TryGetValue(def.Id, out var defSha) && defSha == def.Sha)
+                        if (currentDefs.TryGetValue(def.Id, out var defSha) && defSha == def.Sha && files.Any(x => x == def.File))
                         {
                             _logger.Trace("Indexer already up to date: {0}", def.File);