Selection of a dialog is required for a playbook catalog item

[lgalis]

Selection of a dialog is required for playbook catalog

Links

https://bugzilla.redhat.com/show_bug.cgi?id=1574204

Make sure the issue in this BZ is also fixed, as I reverted the changes made in #3413.

Steps for Testing/QA

1. Make sure a dialog is required when adding a Playbook Catalog Item
2. Make sure the radio button for switching between a new and existing dialog is displayed when editing an existing catalog item.

After:

[lgalis]

@miq_bot add_label bug

[miq-bot]

Checked commit lgalis@7b7f01c with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 1 offense detected

**

• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby23, which recognizes
warning: 2.3.6-compliant syntax, but you are running 2.3.3.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

[lgalis]

@miq-bot add_label automation/ansible, gaprindashvili/yes
@h-kataria - please review

[lgalis]

@miq-bot add_label bug

[JPrause]

@miq-bot add_label blocker

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit 7d5f48c7e6eb5a7e8179aef76d1eed7a1b8b7b6b
Author: Harpreet Kataria <hkataria@redhat.com>
Date:   Tue May 15 14:34:51 2018 -0400

    Merge pull request #3926 from lgalis/dialog_flag_required_for_playbook_catalog
    
    Selection of a dialog is required for a playbook catalog item
    (cherry picked from commit 8c5aca41a689726ae663dde144a76a67852c98e2)
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1578976