Fix removing signature when switching to identity with an empty sig in HTML...

Aleksander Machniak

2015-08-01 b45e9b49b9e4d38f6beebfb15f76e7d2b5d7e3c7

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-- Updates from version 0.4-beta
 
ALTER TABLE `users` CHANGE `last_login` `last_login` datetime DEFAULT NULL;
UPDATE `users` SET `last_login` = NULL WHERE `last_login` = '1000-01-01 00:00:00';