[BUGFIX] Properly setup AbstractSitemapGenerator construction
When calling /sitemal.xml on a page, GoogleSitemapController.php did not properly construct any SitemapGenerator, always resulting in an $pageId=0 not Found error.
When calling /sitemal.xml on a page, GoogleSitemapController.php did not properly construct any SitemapGenerator, always resulting in an $pageId=0 not Found error.