#20 Browser.cancel may return error

[George P]

Calling Browser.cancel may cause the browser in some cases to load a page and in some others to display an error message.

[Pashalis Padeleris]

Fixed. When using Browser.loadPageAsync if the container of the Page instance returned to the PageListener is null, it indicates that the operation was cancelled gracefully (without errors, i.e. using the Browser.cancel() method).