Disconnected Satellite with 'undefined method `find' for nil:NilClass' when importing content that has gpg_keys associated to it

Issue

When a custom repository tied to a GPG key on a connected satellite is exported, and then that repository is imported into a disconnected satellite server, these lines are observed in /var/log/foreman/production.log:

2022-05-25T10:22:02 [E|app|0a12262c] NoMethodError: undefined method `find' for nil:NilClass
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/services/katello/pulp3/content_view_version/metadata_map.rb:108:in `gpg_key_for_product'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/services/katello/pulp3/content_view_version/metadata_map.rb:63:in `block in parse_products'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/services/katello/pulp3/content_view_version/metadata_map.rb:57:in `map'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/services/katello/pulp3/content_view_version/metadata_map.rb:57:in `parse_products'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/services/katello/pulp3/content_view_version/metadata_map.rb:27:in `initialize'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/lib/actions/katello/content_view_version/import.rb:6:in `new'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/katello-4.1.1.56/app/lib/actions/katello/content_view_version/import.rb:6:in `plan'
 0a12262c | /opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.4.9/lib/dynflow/action.rb:515:in `block (3 levels) in execute_plan'