if ndbcluster's nodes aren't set, the handlerton can return zero partitions
in the partitioned table. So we should check for that.


sql/partition_info.cc:
  check for zero return added
mysql-test/r/ndb_partition_error2.result:
  New BitKeeper file ``mysql-test/r/ndb_partition_error2.result''
mysql-test/t/ndb_partition_error2-master.opt:
  New BitKeeper file ``mysql-test/t/ndb_partition_error2-master.opt''
mysql-test/t/ndb_partition_error2.test:
  New BitKeeper file ``mysql-test/t/ndb_partition_error2.test''