Apply suggestions from code review

Co-authored-by: David Pine <david.pine@microsoft.com>

src/Services/Basket/Basket.API/Auth/Server/AuthorizationHeaderParameterOperationFilter.cs

@@ -10,8 +10,7 @@ public class AuthorizationHeaderParameterOperationFilter : IOperationFilter
 
         if (isAuthorized && !allowAnonymous)
         {
-            if (operation.Parameters == null)
-                operation.Parameters = new List<OpenApiParameter>();
+            operation.Parameters ??= new List<OpenApiParameter>();
 
 
             operation.Parameters.Add(new OpenApiParameter

src/Services/Basket/Basket.API/Infrastructure/Exceptions/FailingMiddlewareAppBuilderExtensions.cs

@@ -6,6 +6,7 @@ public static class FailingMiddlewareAppBuilderExtensions
     {
         return UseFailingMiddleware(builder, null);
     }
+
     public static IApplicationBuilder UseFailingMiddleware(this IApplicationBuilder builder, Action<FailingOptions> action)
     {
         var options = new FailingOptions();

src/Services/Basket/Basket.API/Infrastructure/Repositories/RedisBasketRepository.cs

@@ -1,4 +1,5 @@
-namespace Microsoft.eShopOnContainers.Services.Basket.API.Infrastructure.Repositories;
+namespace Microsoft.eShopOnContainers.Services.Basket.API.Infrastructure.Repositories;
+
 public class RedisBasketRepository : IBasketRepository
 {
     private readonly ILogger<RedisBasketRepository> _logger;

src/Services/Basket/Basket.API/IntegrationEvents/Events/OrderStartedIntegrationEvent.cs

@@ -1,7 +1,7 @@
 namespace Basket.API.IntegrationEvents.Events;
 
 // Integration Events notes: 
-// An Event is “something that has happened in the past”, therefore its name has to be   
+// An Event is "something that has happened in the past", therefore its name has to be   
 // An Integration Event is an event that can cause side effects to other microsrvices, Bounded-Contexts or external systems.
 public record OrderStartedIntegrationEvent : IntegrationEvent
 {

src/Services/Basket/Basket.API/IntegrationEvents/Events/ProductPriceChangedIntegrationEvent.cs

@@ -1,7 +1,7 @@
 namespace Microsoft.eShopOnContainers.Services.Basket.API.IntegrationEvents.Events;
 
 // Integration Events notes: 
-// An Event is “something that has happened in the past”, therefore its name has to be   
+// An Event is "something that has happened in the past", therefore its name has to be   
 // An Integration Event is an event that can cause side effects to other microsrvices, Bounded-Contexts or external systems.
 public record ProductPriceChangedIntegrationEvent : IntegrationEvent
 {

src/Services/Basket/Basket.API/Model/BasketCheckout.cs

@@ -1,4 +1,5 @@
-namespace Basket.API.Model;
+namespace Basket.API.Model;
+
 public class BasketCheckout
 {
     public string City { get; set; }

src/Services/Basket/Basket.API/Model/BasketItem.cs

@@ -9,6 +9,7 @@ public class BasketItem : IValidatableObject
     public decimal OldUnitPrice { get; set; }
     public int Quantity { get; set; }
     public string PictureUrl { get; set; }
+
     public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
     {
         var results = new List<ValidationResult>();

src/Services/Basket/Basket.API/Model/CustomerBasket.cs

@@ -1,9 +1,10 @@
-namespace Microsoft.eShopOnContainers.Services.Basket.API.Model;
+namespace Microsoft.eShopOnContainers.Services.Basket.API.Model;
+
 public class CustomerBasket
 {
     public string BuyerId { get; set; }
 
-    public List<BasketItem> Items { get; set; } = new List<BasketItem>();
+    public List<BasketItem> Items { get; set; } = new();
 
     public CustomerBasket()
     {