解决数据同步问题（历史邮件通知validate问题）

lib/trustie/gitlab/sync.rb

@@ -22,7 +22,10 @@ module Trustie
 
         def sync_user(user)
             u = add_user(user)
-            user.save! if u
+            if user.mail_notification.blank? or user.mail_notification == "only_assigned" or user.mail_notification == "only_my_events"
+              user.mail_notification = "day"
+            end
+            user.save!
         end
 
         def sync_project(project, opt={})