Temporary hooks for the widgets feature team in dynamic_sidebar() and is_active_sidebar().

props westonruter.
fixes #25368.


git-svn-id: https://develop.svn.wordpress.org/trunk@25580 602fd350-edb4-49c9-b593-d223f7449a82
Use correct variable. props helen. see #17071.


git-svn-id: https://develop.svn.wordpress.org/trunk@25581 602fd350-edb4-49c9-b593-d223f7449a82