The Board continues churning out precedent-setting decisions as year-end approaches.  Two days before the Christmas holiday, in Wal-Mart Stores, Inc., 368 NLRB No. 146 (Dec. 16, 2019), the NLRB applied its new view on handbook rules—the Boeing test—to Wal-Mart’s policy that employees can only wear “small, non-distracting” union insignia…