Avoid 404 for wp-activate.php.

props nullvariable.
fixes #24960.


git-svn-id: https://develop.svn.wordpress.org/trunk@25690 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-activate.php

@@ -21,6 +21,9 @@ if ( !is_multisite() ) {
 if ( is_object( $wp_object_cache ) )
 	$wp_object_cache->cache_enabled = false;
 
+// Fix for page title
+$wp_query->is_404 = false;
+
 /**
  * Fires before the Site Activation page is loaded.
  *