AbstractBookmarkableMapper sets pageParams to null, might be invalid

When adding query params like ?4-1.IFormSubmitListener-xyz to a wicket page expecting path params, AbstractBookmarkableMapper sets all pageParams to null, but this leads to weird behavior for path params.

See quickstart at https://github.com/tkruse/pageparams

When opening the page with
http://localhost:8080/home/foo/bar
Then Page content says "foo bar." as required.

When opening the same page with
http://localhost:8080/home/foo/bar?4-1.IFormSubmitListener-xyz
Then Page content says "null null."

This is an unlikely scenario to happen in general I guess, but still it feels like a bug to me. Not sure what other query params could trigger this.