If an argument is null or empty, it is not included in the api request anymore.

Author: dusda

src/Rentler.SmartyStreets/ApiClient.cs

@@ -40,7 +40,8 @@ public string CreateAddress(string endpoint, Dictionary<string, string> args)
 
 			var keys = args.Keys.ToArray();
 			for (int i = 0; i < keys.Length; i++)
-				parameters += keys[i] + "=" + Uri.EscapeUriString(args[keys[i]]) + "&";
+				if (!string.IsNullOrWhiteSpace(keys[i]))
+					parameters += keys[i] + "=" + Uri.EscapeUriString(args[keys[i]]) + "&";
 
 			parameters = parameters.Replace("#", "");
 			return url + parameters;