To reproduce bug:
1. Create site template
2. Create pages tree in site template, like root pages: page1, page2, page3, and subpages for page2: page21, page22, page23
3. Place on main page sitemap portlet, configure it to use page2 as root
4. create new site from this site-templates.
Expected behavior: sitemap portlet displayed pages - subpages of page2 - but in created site.
Current behavior: sitemap display nothing, as well as it is not possible to configure it (configuration popup is empty with error in stack trace).
It looks like sitemap properties continue to reference root page in site template (not in created site) and cannot handle it