[Satellite6] Undefined method `default_capsule?' for nil:NilClass error while enabling any repository from WebUI

Issue

• When trying to enable a repository from satellite WebUI, it gives an error

undefined method `default_capsule?' for nil:NilClass (NoMethodError)
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.137/app/models/katello/glue/pulp/repo.rb:212:in `importer_ssl_options'
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.0.0.137/app/lib/actions/katello/repository/create.rb:15:in `block in plan'
/opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/logging-1.8.2/lib/logging/diagnostic_context.rb:323:in `block in create_with_logging_context'