Fix empty state partial check

spec/controllers/projects/clusters_controller_spec.rb

@@ -72,7 +72,7 @@ describe Projects::ClustersController do
           go
 
           expect(response).to have_gitlab_http_status(:ok)
-          expect(response).to render_partial(:index)
+          expect(response).to render_template(:index, partial: :empty_state)
           expect(assigns(:clusters)).to eq([])
         end