Trying to render autoinstallation templates for SUSE Linux Enterprise Server (12) via Foreman 1.19.0/Katello 3.8 fails with the following backtrace:

2018-10-04T19:59:11 [F|app|] ArgumentError (There was no default layout for UnattendedController in #<ActionView::PathSet:0x000000000ae15438 @paths=[#<ActionView::OptimizedFileSystemResolver:
0x00000000046fad20 @pattern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Resolver::Cache:0x46facd0 keys=2 queries=0>, @path="/usr/share/foreman/app
/views">, #<ActionView::OptimizedFileSystemResolver:0x00000000047082e0 @pattern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Resolver::Cache:0x4708
2b8 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/foreman_ansible-2.2.9/app/views">, #<ActionView::OptimizedFileSystemResolver:0x0000000004709d98 @pattern=":prefix/:a
ction{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Resolver::Cache:0x4709cf8 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/foreman_remote_e
xecution-1.5.6/app/views">, #<ActionView::OptimizedFileSystemResolver:0x000000000470b670 @pattern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Reso
lver::Cache:0x470b648 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.8.0/app/views">, #<ActionView::OptimizedFileSystemResolver:0x000000000470c9d0 @pattern=" 
:prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Resolver::Cache:0x470c980 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/forema
n_docker-4.1.0/app/views">, #<ActionView::OptimizedFileSystemResolver:0x000000000470ec80 @pattern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Reso
lver::Cache:0x470ebe0 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/foreman-tasks-0.13.4/app/views">, #<ActionView::OptimizedFileSystemResolver:0x00000000047101e8 @pa
ttern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Resolver::Cache:0x47101c0 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems
/bastion-6.1.11/app/views">, #<ActionView::OptimizedFileSystemResolver:0x00000000047121c8 @pattern=":prefix/:action{.:locale,}{.:formats,}{+:variants,}{.:handlers,}", @cache=#<ActionView::Res
olver::Cache:0x4712178 keys=0 queries=0>, @path="/opt/theforeman/tfm/root/usr/share/gems/gems/apipie-rails-0.5.9/app/views">]>):                                                               
2018-10-04T19:59:11 [F|app|]                                                                                                                                                                   
2018-10-04T19:59:11 [F|app|] app/controllers/application_controller.rb:338:in `generic_exception'  

URL of foreman-debug output: http://debugs.theforeman.org/foreman-debug-HNMbp.tar.xz

Other OSes like RHEL/CentOS work fine. I did not customize the provided templates in any way, but only associated them with the respective operating system.