Fixed that viewing/editing a wiki page without WikiContent raises an error (#14986).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@12220 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/wiki_page.rb

@@ -175,9 +175,10 @@ class WikiPage < ActiveRecord::Base
   end
 
   # Saves the page and its content if text was changed
-  def save_with_content
+  def save_with_content(content)
     ret = nil
     transaction do
+      self.content = content
       if new_record?
         # Rails automatically saves associated content
         ret = save