With the search box out of the header, we can reinstate the margin below the main tabs when no level2tabs are visible, by checking that the main tab element is the only child of the header div.
With the search box out of the header, we can reinstate the margin below the main tabs when no level2tabs are visible, by checking that the main tab element is the only child of the header div.

git-svn-id: 36dcc065b18e9ace584b1c777eaeefb1d96b1ee8@1751491 13f79535-47bb-0310-9956-ffa450edef68

apache/forrest,apache/forrest,apache/forrest,apache/forrest,apache/forrest,apache/forrest