Description of problem:
Having a LE with Registry Name Pattern referring to either repository.* variable, and promoting a CCV with a docker repo to this LE raises exception like:

2023-09-08T11:55:26 [E|bac|e990f9c3] undefined method '#label' for NilClass::Jail (NilClass) (Safemode::NoMethodError)
e990f9c3 | /usr/share/gems/gems/safemode-1.3.8/lib/safemode/jail.rb:22:in `method_missing'
e990f9c3 | /usr/share/gems/gems/safemode-1.3.8/lib/safemode.rb:55:in `initialize'
e990f9c3 | /usr/share/gems/gems/safemode-1.3.8/lib/safemode.rb:52:in `eval'
e990f9c3 | /usr/share/gems/gems/katello-4.7.0.31/app/models/katello/repository.rb:875:in `safe_render_container_name'
e990f9c3 | /usr/share/gems/gems/katello-4.7.0.31/app/lib/katello/validators/environment_docker_repositories_validator.rb:25:in `block in validate_repositories'
e990f9c3 | /usr/share/gems/gems/katello-4.7.0.31/app/lib/katello/validators/environment_docker_repositories_validator.rb:24:in `each'
e990f9c3 | /usr/share/gems/gems/katello-4.7.0.31/app/lib/katello/validators/environment_docker_repositories_validator.rb:24:in `validate_repositories'
e990f9c3 | /usr/share/gems/gems/katello-4.7.0.31/app/models/katello/content_view.rb:617:in `block in check_docker_repository_names!'

The reason is here in /usr/share/gems/gems/katello-4.7.0.31/app/models/katello/content_view.rb :

def publish_repositories(override_components = nil)
repositories = composite? ? repositories_to_publish_by_library_instance(override_components).values : repositories_to_publish
repositories.each do |repos|
if repos.is_a? Array
yield repos
else
yield [repos]
end
end
end

or more precisely in:

def repositories_to_publish_by_library_instance(override_components = nil)

1. retrieve the list of repositories in a hash, where the key
2. is the library instance id, and the value is an array
3. of the repositories for that instance.
   repositories_to_publish(override_components).inject({}) do |result, repo|
   result[repo.library_instance] ||= []
   result[repo.library_instance] << repo
   result
   end
   end

which for CCV returns an Array of Array of Katello::Repository

While "repositories_to_publish" method itself (used for non-composite CVs) returns Katello::Repository::ActiveRecord_Relation .

Version-Release number of selected component (if applicable):
Sat 6.11 till 6.13 (at least)

How reproducible:
100%

Steps to Reproduce:
1. Have a docker repo (optionally synced, that doesnt matter)
2. Have a LE with "Registry Name Pattern:" set to e.g.:

<%= organization.label %><%= lifecycle_environment.label %><%= content_view.label %><%= product.label %><%= repository.label %>

(or any other variable from:

repository.name
repository.label
repository.docker_upstream_name

)

3. Have a CV with the docker repo, promoted to that LE
4. Have a CCV with that CV and try promoting it to the LE

Actual results:
4. raises exception as above

Expected results:
4. no exception raised

Additional info: