site deletion fails on badly installed sites

This is pretty annoying:

The command could not be executed succesfully (returned: Warning: Table 'mysql.system' doesn't existquery: SELECT * FROM system WHERE type = 'theme' in /var/hostmaster/drupal-5.x/includes/database.mysql.inc on line 174a:4:{s:4:"site";a:23:{s:4:"root";s:23:"/var/hostmaster/webroot";s:7:"backend";b:1;s:7:"task_id";s:3:"440";s:9:"client_id";s:1:"1";s:12:"client_email";s:19:"webmaster@localhost";s:5:"db_id";s:1:"2";s:7:"profile";s:11:"drupal_wiki";s:8:"platform";s:1:"6";s:12:"publish_path";s:23:"/var/hostmaster/webroot";s:7:"site_id";s:3:"437";s:8:"language";s:2:"en";s:8:"site_url";s:21:"wiki.test.koumbit.net";s:9:"task_type";s:6:"delete";s:7:"site_ip";s:9:"127.0.0.1";s:9:"site_port";i:80;s:7:"db_type";s:5:"mysql";s:7:"db_host";s:9:"localhost";s:9:"db_passwd";s:10:"HHvweCA3QD";s:7:"db_name";s:8:"site_437";s:7:"db_user";s:8:"site_437";s:9:"installed";b:1;s:11:"backup_file";s:65:"/var/hostmaster/backups/wiki.test.koumbit.net-2008-11-27_1.tar.gz";s:12:"redirect_url";s:48:"http://hostmaster.koumbit.net/provision/disabled";}s:12:"error_status";i:1;s:3:"log";a:15:{i:0;a:3:{s:4:"type";s:6:"backup";s:7:"message";s:48:"Generating mysql dump for wiki.test.koumbit.net.";s:9:"timestamp";i:1227823683;}i:1;a:3:{s:4:"type";s:6:"backup";s:7:"message";s:91:"Adding sites directory to /var/hostmaster/backups/wiki.test.koumbit.net-2008-11-27_1.tar.gz";s:9:"timestamp";i:1227823684;}i:2;a:3:{s:4:"type";s:6:"notice";s:7:"message";s:26:"Dropping database site_437";s:9:"timestamp";i:1227823684;}i:3;a:3:{s:4:"type";s:6:"notice";s:7:"message";s:19:"Revoking privileges";s:9:"timestamp";i:1227823684;}i:4;a:3:{s:4:"type";s:7:"warning";s:7:"message";s:32:"Failed to revoke user privileges";s:9:"timestamp";i:1227823685;}i:5;a:3:{s:4:"type";s:5:"error";s:7:"message";s:248:"user warning: There is no such grant defined for user 'site_437' on host 'localhost'query: REVOKE ALL PRIVILEGES ON `site_437`.* FROM `site_437`@`localhost` in /var/hostmaster/drupal-5.x/includes/database.mysql.inc on line 174.";s:9:"timestamp";i:1227823685;}i:6;a:3:{s:4:"type";s:7:"message";s:7:"message";s:65:"Deleting sites/wiki.test.koumbit.net/modules directory sucessful.";s:9:"timestamp";i:1227823685;}i:7;a:3:{s:4:"type";s:7:"message";s:7:"message";s:64:"Deleting sites/wiki.test.koumbit.net/themes directory sucessful.";s:9:"timestamp";i:1227823685;}i:8;a:3:{s:4:"type";s:7:"message";s:7:"message";s:70:"Deleting sites/wiki.test.koumbit.net/files/images directory sucessful.";s:9:"timestamp";i:1227823685;}i:9;a:3:{s:4:"type";s:7:"message";s:7:"message";s:67:"Deleting sites/wiki.test.koumbit.net/files/tmp directory sucessful.";s:9:"timestamp";i:1227823685;}i:10;a:3:{s:4:"type";s:7:"message";s:7:"message";s:72:"Deleting sites/wiki.test.koumbit.net/files/pictures directory sucessful.";s:9:"timestamp";i:1227823685;}i:11;a:3:{s:4:"type";s:7:"message";s:7:"message";s:63:"Deleting sites/wiki.test.koumbit.net/files directory sucessful.";s:9:"timestamp";i:1227823685;}i:12;a:3:{s:4:"type";s:7:"message";s:7:"message";s:57:"Deleting sites/wiki.test.koumbit.net directory sucessful.";s:9:"timestamp";i:1227823685;}i:13;a:3:{s:4:"type";s:7:"message";s:7:"message";s:41:"Removed apache virtual host configuration";s:9:"timestamp";i:1227823685;}i:14;a:3:{s:4:"type";s:6:"notice";s:7:"message";s:25:"Apache has been restarted";s:9:"timestamp";i:1227823685;}}s:8:"messages";a:0:{}}, code: 1)

This is after failing to install a Wiki install profile: http://drupal.org/node/336054