Handle null references to the delete function

Kyoo/Controllers/Repositories/CollectionRepository.cs

@@ -113,6 +113,8 @@ namespace Kyoo.Controllers
 
 		public async Task Delete(Collection obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
 			_database.Collections.Remove(obj);
 			await _database.SaveChangesAsync();
 		}

Kyoo/Controllers/Repositories/EpisodeRepository.cs

@@ -155,6 +155,9 @@ namespace Kyoo.Controllers
 		
 		public async Task Delete(Episode obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
 					_database.Entry(entry).State = EntityState.Deleted;

Kyoo/Controllers/Repositories/GenreRepository.cs

@@ -113,6 +113,9 @@ namespace Kyoo.Controllers
 
 		public async Task Delete(Genre obj)
 		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Genres.Remove(obj);
 			await _database.SaveChangesAsync();
 		}

Kyoo/Controllers/Repositories/LibraryRepository.cs

@@ -128,6 +128,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ProviderLinks != null)
 				foreach (ProviderLink entry in obj.ProviderLinks)

Kyoo/Controllers/Repositories/PeopleRepository.cs

@@ -127,6 +127,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)

Kyoo/Controllers/Repositories/ProviderRepository.cs

@@ -114,6 +114,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}

Kyoo/Controllers/Repositories/SeasonRepository.cs

@@ -146,6 +146,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)

Kyoo/Controllers/Repositories/ShowRepository.cs

@@ -167,6 +167,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			if (obj.GenreLinks != null)
 				foreach (GenreLink entry in obj.GenreLinks)

Kyoo/Controllers/Repositories/StudioRepository.cs

@@ -113,6 +113,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}

Kyoo/Controllers/Repositories/TrackRepository.cs

@@ -103,6 +103,7 @@ namespace Kyoo.Controllers
 		{
 			if (obj == null)
 				throw new ArgumentNullException(nameof(obj));
+			
 			_database.Entry(obj).State = EntityState.Deleted;
 			await _database.SaveChangesAsync();
 		}