include required label_ids param

app/assets/javascripts/boards/services/board_service.js

@@ -31,14 +31,13 @@ class BoardService {
 
   createBoard (board) {
     board.board = board.board || {};
+    board.board.label_ids = (board.labels || []).map(b => b.id);
 
-    if (board.labels && board.labels.length > 0) {
-      board.board.label_ids = board.labels.map(b => b.id);
-      board.board.milestone_id = board.milestone_id;
-    }
     if (board.assignee) {
       board.board.assignee_id = board.assignee.id;
     }
+
+    board.board.milestone_id = board.milestone_id;
     board.board.weight = board.weight;
 
     if (board.id) {