Description of problem:

Error faced :

Error caught: [ActionView::Template::Error] undefined method `[]' for nil:NilClass

We have checked it via API and it is giving the provided result :

https://<cloudforms ip>/api/requests/96000000001751 <=== this is the request ID of Generic Provisioning v1.2 Zone Binding Service.

We have verified from rails console and there is provided entry in the database :

irb(main):003:0> req = MiqRequest.find_by_id('96000000001751')
=> #<ServiceTemplateProvisionRequest id: 96000000001751, description: "Provisioning Service [Generic VM Provisioning v1.2...", approval_state: "approved", type: "ServiceTemplateProvisionRequest", created_on: "2019-04-09 07:36:28", updated_on: "2019-04-09 07:45:54", fulfilled_on: "2019-04-09 07:45:54...>

irb(main):006:0> req.provision_dialog
=> {"description"=>"Generic VM Provisioning v1.2", "buttons"=>"submit,cancel", "label"=>"VM Generic Provisioning v1.2", "dialog_tabs"=>[{"description"=>"", "display"=>nil, "label"=>"General", "display_method"=>nil, "display_method_options"=>nil, "position"=>0, "dialog_groups"=>[{"description"=>nil, ...}

Version-Release number of selected component (if applicable):
Red Hat CloudForms 4.6

How reproducible:
Always

Actual results:
It is a pure UI Bug as we have seen the data is intact via API and in the database.