Description of problem:

Trying to update gpgkey of product gives error Value (NilClass) '' is not any of: ForemanTasks::Concerns::ActionSubject.


Version-Release number of selected component (if applicable):
Satellite 6.5 snap 5


How reproducible:
always

Steps to Reproduce:
1. # hammer -v -u admin -p changeme --output=csv product create --description="cRZfUAOfUsAbtFNOQlsl" --label="byMrTZxiRFxAWqKoqeZP" --name="nDyqHnxwspQgOTzyGvcE" --organization-id="1"
Message,Id,Name
Product created.,65,nDyqHnxwspQgOTzyGvcE

2.# hammer -v -u admin -p changeme --output=csv repository create --content-type="yum" --name="FHuBziZnUxTtYhY" --product-id="65" --publish-via-http="true" --url="http://inecas.fedorapeople.org/fakerepos/zoo3/"
Message,Id,Name
Repository created.,81,FHuBziZnUxTtYhY

3.# hammer -v -u admin -p changeme  repository info --id="81"
ID:                 81
Name:               FHuBziZnUxTtYhY
Label:              FHuBziZnUxTtYhY
Organization:       Default Organization
Red Hat Repository: no
Content Type:       yum
Mirror on Sync:     yes
URL:                http://inecas.fedorapeople.org/fakerepos/zoo3/
Publish Via HTTP:   yes
Published At:       http://sgi-uv20-01.rhts.eng.bos.redhat.com/pulp/repos/Default_Organization/Library/custom/byMrTZxiRFxAWqKoqeZP/FHuBziZnUxTtYhY/
Relative Path:      Default_Organization/Library/custom/byMrTZxiRFxAWqKoqeZP/FHuBziZnUxTtYhY
Download Policy:    on_demand
Product:            
    ID:   65
    Name: nDyqHnxwspQgOTzyGvcE
GPG Key:            

Sync:               
    Status: Not Synced
Created:            2018/11/30 02:44:11
Updated:            2018/11/30 02:44:12
Content Counts:     
    Packages:       0
    Source RPMS:    0
    Package Groups: 0
    Errata:         0
    Module Streams: 0

4. # hammer -v -u admin -p changeme --output=csv gpg create --key="/tmp/8xTQKuJach" --name="i5qBEgw5Z8" --organization-id="1"Message,Id,Name
GPG Key created.,2,i5qBEgw5Z8

5. # hammer -v -u admin -p changeme --output=csv product update --gpg-key="i5qBEgw5Z8" --id="65" --organization-id="1"
Could not update the product:
  Value (NilClass) '' is not any of: ForemanTasks::Concerns::ActionSubject.


Actual results:

Updating product with gpgkey gives error and 

production.log showed

2018-11-29T22:08:03 [I|app|] Started GET "/katello/api/gpg_keys?name=i5qBEgw5Z8&organization_id=1" for IP at 2018-11-29 22:08:03 -0500
2018-11-29T22:08:03 [I|app|d46a5] Processing by Katello::Api::V2::GpgKeysController#index as JSON
2018-11-29T22:08:03 [I|app|d46a5]   Parameters: {"name"=>"i5qBEgw5Z8", "organization_id"=>"1", "api_version"=>"v2", "gpg_key"=>{}}
2018-11-29T22:08:03 [I|app|d46a5] Authorized user admin(Admin User)
2018-11-29T22:08:03 [I|app|d46a5] Current user set to admin (admin)
2018-11-29T22:08:03 [I|app|d46a5]   Rendering /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.9.0/app/views/katello/api/v2/gpg_keys/index.json.rabl within katello/api/v2/layouts/collection
2018-11-29T22:08:03 [I|app|d46a5]   Rendered /opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.9.0/app/views/katello/api/v2/gpg_keys/index.json.rabl within katello/api/v2/layouts/collection (9.4ms)
2018-11-29T22:08:03 [I|app|d46a5] Completed 200 OK in 37ms (Views: 8.8ms | ActiveRecord: 9.3ms)
2018-11-29T22:08:03 [I|app|] Started PUT "/katello/api/products/65" for 10.16.64.56 at 2018-11-29 22:08:03 -0500
2018-11-29T22:08:03 [I|app|966cc] Processing by Katello::Api::V2::ProductsController#update as JSON
2018-11-29T22:08:03 [I|app|966cc]   Parameters: {"gpg_key_id"=>2, "api_version"=>"v2", "id"=>"65", "product"=>{"gpg_key_id"=>2}}
2018-11-29T22:08:03 [I|app|966cc] Authorized user admin(Admin User)
2018-11-29T22:08:03 [I|app|966cc] Current user set to admin (admin)
2018-11-29T22:08:03 [I|aud|966cc] Katello::Product (65) update event on gpg_key_id , 2
2018-11-29T22:08:03 [E|bac|966cc] Value (NilClass) '' is not any of: ForemanTasks::Concerns::ActionSubject. (TypeError)
/opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/type_check.rb:54:in `error'
/opt/theforeman/tfm/root/usr/share/gems/gems/algebrick-0.7.3/lib/algebrick/type_check.rb:26:in `Type!'
/opt/theforeman/tfm/root/usr/share/gems/gems/foreman-tasks-0.14.3/app/lib/actions/entry_action.rb:33:in `action_subject'
/opt/theforeman/tfm/root/usr/share/gems/gems/katello-3.9.0/app/lib/actions/katello/repository/update.rb:9:in `plan'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/action.rb:493:in `block (3 levels) in execute_plan'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware/stack.rb:26:in `pass'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware.rb:18:in `pass'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware.rb:35:in `plan'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware/stack.rb:22:in `call'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware/stack.rb:26:in `pass'
/opt/theforeman/tfm/root/usr/share/gems/gems/dynflow-1.1.1/lib/dynflow/middleware.rb:18:in `pass'



Expected results: Successful product update with gpg key.


Additional info: This was working in 6.4.