Updated code to remove unnecessary null coalescing (#8340)

Author: glen-84

src/HotChocolate/AspNetCore/src/AspNetCore.Authorization.Opa/Request/DefaultQueryRequestFactory.cs

@@ -42,7 +42,11 @@ public OpaQueryRequest CreateRequest(OpaAuthorizationHandlerContext context, Aut
 
         var originalRequest = new OriginalRequest(
             httpContext.Request.Headers,
+#if NET8_0
+            httpContext.Request.Host.Value,
+#else
             httpContext.Request.Host.Value ?? string.Empty,
+#endif
             httpContext.Request.Method,
             httpContext.Request.Path.Value!,
             httpContext.Request.Query,

src/HotChocolate/Core/src/Execution.Abstractions/GraphQLException.cs

@@ -29,7 +29,7 @@ public GraphQLException(IError error)
     /// <param name="errors">The errors.</param>
     public GraphQLException(params IError[] errors)
     {
-        Errors = errors ?? [];
+        Errors = errors;
     }
 
     /// <summary>
@@ -38,7 +38,7 @@ public GraphQLException(params IError[] errors)
     /// <param name="errors">The errors.</param>
     public GraphQLException(IEnumerable<IError> errors)
     {
-        Errors = new List<IError>(errors ?? []).AsReadOnly();
+        Errors = new List<IError>(errors).AsReadOnly();
     }
 
     /// <summary>

src/HotChocolate/Core/test/Execution.Tests/Integration/HelloWorldCodeFirst/QueryHelloWorld.cs

@@ -18,7 +18,7 @@ protected override void Configure(IObjectTypeDescriptor descriptor)
 
         descriptor.Field("hello")
             .Argument("to", a => a.Type<StringType>())
-            .Resolve(c => c.ArgumentValue<string>("to") ?? "world");
+            .Resolve(c => c.ArgumentValue<string?>("to") ?? "world");
 
         descriptor.Field("state").Resolve(() => DataStore.State);
     }

src/StrawberryShake/CodeGeneration/test/CodeGeneration.CSharp.Tests/Integration/UploadSchemaHelpers.cs

@@ -58,7 +58,7 @@ public string Upload(
 
             if (objectSingle is not null)
             {
-                return objectSingle.Bar!.Baz!.File!.ReadContents() ?? "null";
+                return objectSingle.Bar!.Baz!.File!.ReadContents();
             }
 
             if (objectList is not null)