Rails5: fix operations controller spec nil parameter

ee/changelogs/unreleased/rails5-fix-ops-controller-spec.yml

+---
+title: 'Rails5: fix operations controller spec nil parameter'
+merge_request: 8209
+author: Jasper Maes
+type: other

ee/spec/controllers/operations_controller_spec.rb

@@ -181,13 +181,13 @@ describe OperationsController do
       end
 
       it 'does not add invalid project ids' do
-        post :create, project_ids: [nil, -1, '-2']
+        post :create, project_ids: ['', -1, '-2']
 
         expect(response).to have_gitlab_http_status(200)
         expect(json_response).to match_schema('dashboard/operations/add', dir: 'ee')
         expect(json_response['added']).to be_empty
         expect(json_response['duplicate']).to be_empty
-        expect(json_response['invalid']).to contain_exactly(nil, '-1', '-2')
+        expect(json_response['invalid']).to contain_exactly('', '-1', '-2')
 
         user.reload
         expect(user.ops_dashboard_projects).to be_empty