fixed: unable to delete an issue status even if it's not used yet

git-svn-id: http://redmine.rubyforge.org/svn/trunk@180 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue_status.rb

@@ -45,6 +45,6 @@ class IssueStatus < ActiveRecord::Base
   
 private
   def check_integrity
-    raise "Can't delete status" if Issue.find(:first, :conditions => ["status_id=?", self.id]) or IssueHistory.find(:first, :conditions => ["status_id=?", self.id])
+    raise "Can't delete status" if Issue.find(:first, :conditions => ["status_id=?", self.id])
   end
 end