When a new version is created, the latest version is updated, then
the new one is made. If making a new one fails (most commonly due to
a name conflict), the latest version is left in a broken state. Set up
the new middleware to revert changes to latest version in this case,
and update the level handler to use the middleware. Also added
warning logs if models do not have editableProperties or postEditableProperties
set.
Address some code review feedback
Correct error code in test
Don't try to send emails to empty addresses
Add tests for subscriptions
Add tests for Next Steps email
Fix specs
Add reason for disabled test
