Selected projects in email notifications on "my account" are lost when the page is redisplayed after a validation error (#18060).

Patch by Felix Schäfer.

git-svn-id: http://svn.redmine.org/redmine/trunk@13638 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/user.rb

@@ -368,7 +368,7 @@ class User < Principal
 
   def notified_project_ids=(ids)
     @notified_projects_ids_changed = true
-    @notified_projects_ids = ids
+    @notified_projects_ids = ids.map(&:to_i).uniq.select {|n| n > 0}
   end
 
   # Updates per project notifications (after_save callback)