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

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

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ALTER TABLE `directive_snippets` ADD `customer_viewable` ENUM('n','y') NOT NULL DEFAULT 'n' AFTER `snippet`;
ALTER TABLE `web_domain` ADD `directive_snippets_id` int(11) unsigned NOT NULL default '0';