Merge branch 'fix-descriptionText-prop-error-warning' into 'master'

Fix descriptionText prop warning appearing in browser console when issue doesn't have description

See merge request gitlab-org/gitlab!42438

app/assets/javascripts/issue_show/components/description.vue

@@ -25,7 +25,8 @@ export default {
     },
     descriptionText: {
       type: String,
-      required: true,
+      required: false,
+      default: '',
     },
     taskStatus: {
       type: String,