last segment can be null (#5)

src/VirtoCommerce.Xapi.Data/Queries/SlugInfoQueryHandler.cs

@@ -42,7 +42,7 @@ public async Task<SlugInfoResponse> Handle(SlugInfoQuery request, CancellationTo
             var currentCulture = request.CultureName ?? store.DefaultLanguage;
 
             var segments = request.Permalink.Split("/", StringSplitOptions.RemoveEmptyEntries);
-            var lastSegment = segments.Last();
+            var lastSegment = segments.LastOrDefault();
 
             var criteria = AbstractTypeFactory<SeoSearchCriteria>.TryCreateInstance();
             criteria.StoreId = store.Id;