Rudder

When a Directive is modified, and that directive is used in at least one rule, on Directive save, a pop-up showing the dependency and asking for confirmation is displayed.

If the form is saved one time with error before that, then the pop-up is broken (it is empty, only the top border with the closing cross is displayed).

Step to reproduce:

• create a "User management" Directive and save it, add it to a Rule.
• comme back to the directive, then:
  • add a new "user" section but don't fill anything for the new user,
  • save the form, which display some error about login being mandatory,
  • remove the user section,
  • save: that time, the directive is broken.

The bug is only in 2.5.*, the pop-up was added on that branch.