1) Create a product with no repos
2) Create a syncplan, set Sync Enabled to false (uncheck the box)
3) Try to create a Docker repository in Product from step (1)
2017-01-16 18:37:55 [foreman-tasks/action] [E] undefined method `iso8601' for nil:NilClass (NoMethodError)
| /opt/theforeman/tfm/root/usr/share/gems/gems/katello-184.108.40.206/app/models/katello/sync_plan.rb:57:in `schedule_format'
it creates parts of the repo in the database, but not entirely and user is unable to proceed
*** This bug has been marked as a duplicate of bug 1410939 ***