Follows r2720 (#3308).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2727 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/wiki_content.rb

@@ -22,7 +22,7 @@ class WikiContent < ActiveRecord::Base
   belongs_to :page, :class_name => 'WikiPage', :foreign_key => 'page_id'
   belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
   validates_presence_of :text
-  validates_length_of :comments, :maximum => 255
+  validates_length_of :comments, :maximum => 255, :allow_nil => true
   
   acts_as_versioned
   class Version