mysql-test/r/ndb_read_multi_range.result:
  Add tests of null handling to read_multi
mysql-test/t/ndb_read_multi_range.test:
  Add tests of null handling to read_multi
ndb/include/ndbapi/NdbOperation.hpp:
  Get recattr
ndb/include/ndbapi/NdbRecAttr.hpp:
  Get recattr
sql/ha_ndbcluster.cc:
  Fix handling of null values wrt read multi range
sql/ha_ndbcluster.h:
  Fix handling of null values wrt read multi range