* Fix db for dm.

db/update18.3.sql

@@ -1045,6 +1045,8 @@ CHANGE `editedBy` `editedBy` char(30) NOT NULL DEFAULT '',
 CHANGE `editedDate` `editedDate` datetime NULL;
 
 ALTER TABLE `zt_workflowfield`
+CHANGE `default` `default` varchar(100) NOT NULL DEFAULT '',
+CHANGE `rules` `rules` varchar(255) NOT NULL DEFAULT '',
 CHANGE `expression` `expression` text NULL,
 CHANGE `placeholder` `placeholder` varchar(100) NOT NULL DEFAULT '',
 CHANGE `desc` `desc` text NULL,

db/zentao.sql

@@ -12257,8 +12257,8 @@ CREATE TABLE IF NOT EXISTS `zt_workflowfield` (
   `control` varchar(20) NOT NULL,
   `expression` text NULL,
   `options` text NOT NULL,
-  `default` varchar(100) NOT NULL,
-  `rules` varchar(255) NOT NULL,
+  `default` varchar(100) NOT NULL DEFAULT '',
+  `rules` varchar(255) NOT NULL DEFAULT '',
   `placeholder` varchar(100) NOT NULL DEFAULT '',
   `order` smallint(5) unsigned NOT NULL,
   `searchOrder` smallint(5) unsigned NOT NULL DEFAULT '0',