Commented Issue: HttpActionExecutedContext.Response setter throws exception [1176]

Simple object initializer setting the response property

```
var context = new HttpActionExecutedContext
{
Response = new Http.HttpResponseMessage()
};
```

throws an exception:

```
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Web.Http.Filters.HttpActionExecutedContext.set_Response(HttpResponseMessage value)

```

NuGet package Microsoft.Net.Http ver. __2.2.13__
Comments: Due to there being easy workarounds, and this not being a common scenario, moving to vNext.