Bug #26591  Cluster handler does not set bits in null bytes correctly: Improved comments
ha_ndbcluster_binlog.cc:
  Bug #26591  Cluster handler does not set bits in null bytes correctly: Using empty_record() instead of bzero


sql/ha_ndbcluster.cc:
  Bug #26591  Cluster handler does not set bits in null bytes correctly: Improved comments
sql/ha_ndbcluster_binlog.cc:
  Bug #26591  Cluster handler does not set bits in null bytes correctly: Using empty_record() instead of bzero