Merge branch 'bugfix-removebtn-board-settings-sidebar' into 'master'

Fix console error when open board list settings sidebar

See merge request gitlab-org/gitlab!33912

app/assets/javascripts/boards/stores/boards_store.js

@@ -43,6 +43,7 @@ const boardsStore = {
   },
   detail: {
     issue: {},
+    list: {},
   },
   moving: {
     issue: {},
@@ -74,6 +75,7 @@ const boardsStore = {
     this.filter.path = getUrlParamsArray().join('&');
     this.detail = {
       issue: {},
+      list: {},
     };
   },
   showPage(page) {