Remove nested Promise from board blank state

app/assets/javascripts/boards/components/board_blank_state.vue

@@ -29,25 +29,25 @@ export default {
         });
       });
 
-      // Save the labels
-      boardsStore
-        .generateDefaultLists()
-        .then(res => res.data)
-        .then(data => {
-          data.forEach(listObj => {
+      const loadListIssues = listObj => {
         const list = boardsStore.findList('title', listObj.title);
 
         if (!list) {
-              return;
+          return null;
         }
 
         list.id = listObj.id;
         list.label.id = listObj.label.id;
-            list.getIssues().catch(() => {
+        return list.getIssues().catch(() => {
           // TODO: handle request error
         });
-          });
-        })
+      };
+
+      // Save the labels
+      boardsStore
+        .generateDefaultLists()
+        .then(res => res.data)
+        .then(data => Promise.all(data.map(loadListIssues)))
         .catch(() => {
           boardsStore.removeList(undefined, 'label');
           Cookies.remove('issue_board_welcome_hidden', {