changed regex for backup_dir (allow empty backup-dir to disable backups)

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

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ALTER TABLE `web_domain` ADD `seo_redirect` VARCHAR( 255 ) default NULL AFTER `redirect_path`;
ALTER TABLE `web_folder_user` ADD `server_id` INT( 11 ) NOT NULL DEFAULT '0' AFTER `sys_perm_other`;