Reverted back to Single<T> instead of SingleOrDefault<T> except when searching for an episode in DB.

NzbDrone.Core/Providers/EpisodeProvider.cs

@@ -34,7 +34,7 @@ namespace NzbDrone.Core.Providers
 
         public virtual Episode GetEpisode(long id)
         {
-            return _database.SingleOrDefault<Episode>(id);
+            return _database.Single<Episode>(id);
         }
 
         public virtual Episode GetEpisode(int seriesId, int seasonNumber, int episodeNumber)

NzbDrone.Core/Providers/IndexerProvider.cs

@@ -54,7 +54,7 @@ namespace NzbDrone.Core.Providers
 
         public virtual IndexerSetting GetSettings(Type type)
         {
-            return _database.SingleOrDefault<IndexerSetting>("WHERE IndexProviderType = @0", type.ToString());
+            return _database.Single<IndexerSetting>("WHERE IndexProviderType = @0", type.ToString());
         }
 
         public virtual void InitializeIndexers(IList<IndexerBase> indexers)

NzbDrone.Core/Providers/MediaFileProvider.cs

@@ -196,7 +196,7 @@ namespace NzbDrone.Core.Providers
 
         public virtual EpisodeFile GetEpisodeFile(int episodeFileId)
         {
-            return _database.SingleOrDefault<EpisodeFile>(episodeFileId);
+            return _database.Single<EpisodeFile>(episodeFileId);
         }
 
         public virtual List<EpisodeFile> GetEpisodeFiles()

NzbDrone.Core/Providers/QualityProvider.cs

@@ -53,7 +53,7 @@ namespace NzbDrone.Core.Providers
 
         public virtual QualityProfile Get(int profileId)
         {
-            return _database.SingleOrDefault<QualityProfile>(profileId);
+            return _database.Single<QualityProfile>(profileId);
         }
 
         public virtual void SetupDefaultProfiles()