remove trailing white space from app/models/issue_relation.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@16073 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue_relation.rb

@@ -91,7 +91,7 @@ class IssueRelation < ActiveRecord::Base
         self.issue_to = Issue.visible(user).find_by_id(issue_id)
       end
     end
-    
+
     super(attrs)
   end