Description of problem:
Bug related to https://bugzilla.redhat.com/show_bug.cgi?id=1496190.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Create a service of type orchestration.
2. On the catalog item - create a button group and button.
3. Login in SUI and click on the service.
API error is thrown .

Actual results:


Expected results:


Additional info:

URL : https://10.8.198.50/api/services/36?expand=vms%2Corchestration_stacks&attributes=name%2Cguid%2Ccreated_at%2Ctype%2Cdescription%2Cpicture%2Cpicture.image_href%2Cevm_owner.name%2Cevm_owner.userid%2Cmiq_group.description%2Call_service_children%2Caggregate_all_vm_cpus%2Caggregate_all_vm_memory%2Caggregate_all_vm_disk_count%2Caggregate_all_vm_disk_space_allocated%2Caggregate_all_vm_disk_space_used%2Caggregate_all_vm_memory_on_disk%2Cretired%2Cretirement_state%2Cretirement_warn%2Cretires_on%2Cactions%2Ccustom_actions%2Cprovision_dialog%2Cservice_resources%2Cchargeback_report%2Cservice_template%2Cparent_service%2Cpower_state%2Cpower_status%2Coptions%2Cvms.ipaddresses%2Cvms.snapshots%2Cvms.v_total_snapshots%2Cvms.v_snapshot_newest_name%2Cvms.v_snapshot_newest_timestamp%2Cvms.v_snapshot_newest_total_size%2Cvms.supports_console%3F%2Cvms.supports_launch_cockpit%3F

Error: 
{"error":{"kind":"internal_server_error","message":"undefined method `keys' for nil:NilClass","klass":"NoMethodError"}}