[Satellite6] Error importing puppet classes from a capsule server

Issue

• While importing puppet classes from a capsule server getting an error.
• Clicking import from the Satellite Web interface or running foreman-rake puppet:import:puppet_classes both results in an error.

NoMethodError
undefined method `map' for true:TrueClass
app/services/puppet_class_importer.rb:133:in `actual_environments'
app/services/puppet_class_importer.rb:24:in `changes'
app/controllers/concerns/foreman/controller/environments.rb:11:in `import_environments'
app/models/concerns/foreman/thread_session.rb:33:in `clear_thread'
lib/middleware/catch_json_parse_errors.rb:9:in `call'