Adds changes from @wortschi review

- removes a redundant empty state class

ee/app/assets/javascripts/environments_dashboard/components/dashboard/dashboard.vue

@@ -193,7 +193,6 @@ export default {
 
       <gl-empty-state
         v-else
-        class="js-empty-state"
         :title="$options.emptyDashboardHeader"
         :svg-path="emptyDashboardSvgPath"
       >

ee/spec/frontend/environments_dashboard/components/__snapshots__/dashboard_spec.js.snap

@@ -66,7 +66,6 @@ exports[`dashboard should match the snapshot 1`] = `
     class="prepend-top-default"
   >
     <gl-empty-state-stub
-      class="js-empty-state"
       svgpath="/assets/illustrations/operations-dashboard_empty.svg"
       title="Add a project to the dashboard"
     />