On an empty wiki, space administration displays the importer and "your wiki is empty" message

Seems like regression of http://jira.xwiki.org/jira/browse/XWIKI-2592 ...

I set up empty XWiki Enterpise from xwiki-enterprise-web-2.2-rc-2.war. Then I went to XWIKI / ADMINISTER SPACE: XWIKI and tried to import xwiki-enterprise-wiki-2.2-rc-2.xar

The following error message was displayed

Importing xwiki-application-administration-1.2.xar: Error while preparing importing

    * 0 Document(s) installed
    * 0 Document(s) skipped
    * 0 Document(s) with error

When I manually changed URL in browser from
/xwiki/bin/admin/Main/WebPreferences
to
/xwiki/bin/import/Main/WebPreferences
the XAR imported fine