Unhandled exception if playlist contains deleted video

[faniereynders]

When a playlist contains a deleted video it throws an exception:

NullReferenceException: Object reference not set to an instance of an object.
sdncast.nl.Services.YouTubeShowsService+<>c.<GetShowsList>b__5_0(PlaylistItem item) in YouTubeShowsService.cs
System.Linq.Enumerable+SelectListIterator<TSource, TResult>.ToList()
System.Linq.Enumerable.ToList<TSource>(IEnumerable<TSource> source)
sdncast.nl.Services.YouTubeShowsService.GetShowsList(string playlist) in YouTubeShowsService.cs
sdncast.nl.Services.YouTubeShowsService.GetRecordedShowsAsync(ClaimsPrincipal user, bool disableCache, string playlist) in YouTubeShowsService.cs
sdncast.nl.Pages.IndexModel.OnGetAsync(Nullable<bool> disableCache) in Index.cshtml.cs
Microsoft.AspNetCore.Mvc.RazorPages.Internal.ExecutorFactory+NonGenericTaskHandlerMethod.Execute(object receiver, object[] arguments)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeHandlerMethodAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeNextPageFilterAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.RazorPages.Internal.PageActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)