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

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

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ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;