title: Possible null assignment to entity marked with notnull attribute
body: <p>I get this warning on <code>request.GetResponse().GetResponseStream()</code> How should I handle this?</p>
  
  <pre><code>public void GetUserList(string url)
  {
      var request = (HttpWebRequest) WebRequest.Create(url);
      string response;
  
      using (var stream = new StreamReader(request.GetResponse().GetResponseStream()))
      {
          response = stream.ReadToEnd();
      }
  
      response = DelimiterStrings.Aggregate(response, (current, delim) =&gt; current.Replace(delim, "\n"));
  
      foreach (var line in response.Split(DelimiterChars))
      {
          MainWindow.UserList.Add(line);
      }
  }
  </code></pre>
  
  <p>Resharper doesn't know how to "fix it"</p>