$wgAllowCategorizedRecentChanges = true; ("limit to categories" feature) doesn't work since revision 36376.
I get this error:

Warning: Invalid argument supplied for foreach() in C:\wamp\www\testwiki\includes\specials\Recentchanges.php on line 412

That line contains:
foreach ( $opts['categories'] AS $cat )

When I change it back to:
foreach ( $categories AS $cat )
the error is gone, but the feature still doesn't work anymore.

Version: 1.13.x
Severity: normal