Prevents empty button in jobs empty state

Returns `null` instead of an empty object to make
sure Vue doesn't render the button

app/assets/javascripts/jobs/store/getters.js

@@ -42,7 +42,7 @@ export const emptyStateIllustration = state =>
   (state.job && state.job.status && state.job.status.illustration) || {};
 
 export const emptyStateAction = state =>
-  (state.job && state.job.status && state.job.status.action) || {};
+  (state.job && state.job.status && state.job.status.action) || null;
 
 export const isScrollingDown = state => isScrolledToBottom() && !state.isTraceComplete;
 

changelogs/unreleased/54021-empty-button.yml

+---
+title: Prevent empty button being rendered in empty state
+merge_request:
+author:
+type: fixed

spec/javascripts/jobs/components/empty_state_spec.js

@@ -84,6 +84,7 @@ describe('Empty State', () => {
       vm = mountComponent(Component, {
         ...props,
         content,
+        action: null,
       });
 
       expect(vm.$el.querySelector('.js-job-empty-state-action')).toBeNull();