null check instead

Author: RenderMichael

dotnet/src/webdriver/Response.cs

@@ -95,9 +95,9 @@ public static Response FromJson(string value)
             {
                 // Special case code for the new session command. If the response contains
                 // sessionId and capabilities properties, fix up the session ID and value members.
-                if (valueDictionary.TryGetPropertyValue("sessionId", out JsonNode? session) && session is not null)
+                if (valueDictionary.TryGetPropertyValue("sessionId", out JsonNode? session))
                 {
-                    sessionId = session.ToString();
+                    sessionId = session?.ToString();
                     if (valueDictionary.TryGetPropertyValue("capabilities", out JsonNode? capabilities))
                     {
                         contents = capabilities;