Always instanciate a relation.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11610 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/issues_controller.rb

@@ -113,6 +113,8 @@ class IssuesController < ApplicationController
     @edit_allowed = User.current.allowed_to?(:edit_issues, @project)
     @priorities = IssuePriority.active
     @time_entry = TimeEntry.new(:issue => @issue, :project => @issue.project)
+    @relation = IssueRelation.new
+
     respond_to do |format|
       format.html {
         retrieve_previous_and_next_issue_ids