Cannot create Service Dialog from Template depending on navigation steps

[hstastna]

There's an issue regarding creating Service Dialog from selected Template: error occurs if we provide creating Service Dialog from a template selected from the list of Templates under for example "Ansible Tower Automation Manager".

Steps:

1. Automation > Ansible Tower > Explorer > Templates accordion
2. In accordion, click on some node with child nodes, for example on "Ansible Tower Automation Manager", and appropriate templates are being displayed
3. Check the checkbox of some template in the list
4. Configuration > Create Service Dialog from this Template
   => nothing happens in the UI, error:

[----] I, [2019-11-04T16:00:58.629721 #15605:58bb58c]  INFO -- : Started POST "/automation_manager/x_button/19?pressed=configscript_service_dialog" for 127.0.0.1 at 2019-11-04 16:00:58 +0100
[----] I, [2019-11-04T16:00:58.675476 #15605:58bb58c]  INFO -- : Processing by AutomationManagerController#x_button as JS
[----] I, [2019-11-04T16:00:58.675611 #15605:58bb58c]  INFO -- :   Parameters: {"miq_grid_checks"=>"115", "pressed"=>"configscript_service_dialog", "id"=>"19"}
[----] F, [2019-11-04T16:00:58.691578 #15605:58bb58c] FATAL -- : Error caught: [NoMethodError] undefined method `id' for nil:NilClass
/home/hstastna/manageiq/manageiq-ui-classic/app/controllers/automation_manager_controller.rb:448:in `configscript_service_dialog'
/home/hstastna/manageiq/manageiq-ui-classic/app/controllers/application_controller/explorer.rb:108:in `x_button'

Expected result:

Note:
While being on All Ansible Tower Templates node in accordion, creating Service Dialog from a selected Template works as expected.

[hstastna]

@miq-bot assign @hstastna