On r53052 domas disabled querying specific namespace if miser mode is enabled.
The query now produce erroneus results.
*It silently skips the page_namespace where clause instead of giving an error.
*It's not documented on api.php nor www.mediawiki.org
Either 'fix' the above issues or implement whatever domas told about how to have efficient subcategory access.
Version: 1.16.x
Severity: normal