Disable children when checking parent notifiable.

git-svn-id: http://svn.redmine.org/redmine/trunk@12996 e93f8b46-1217-0410-a6f0-8f06a7374b81
Don't run the test if Redcarpet is not available (#16236).

git-svn-id: http://svn.redmine.org/redmine/trunk@12997 e93f8b46-1217-0410-a6f0-8f06a7374b81