Fixed that issue notes preview is broken by r10547 (#1554).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10585 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/previews_controller.rb

@@ -26,7 +26,7 @@ class PreviewsController < ApplicationController
       if @description && @description.gsub(/(\r?\n|\n\r?)/, "\n") == @issue.description.to_s.gsub(/(\r?\n|\n\r?)/, "\n")
         @description = nil
       end
-      @notes = params[:notes]
+      @notes = (params[:issue] ? params[:issue][:notes] : nil)
     else
       @description = (params[:issue] ? params[:issue][:description] : nil)
     end