It is ok for a partitioned table to have only 1 partition.  This test is just to show that
doing the ALTER TABLE ADD PARTITION doesn't crash the server.

partition_mgm_err.result:
  Added result block for test of bug #15820
partition_mgm_err.test:
  Added test block for bug #15820


mysql-test/t/partition_mgm_err.test:
  Added test block for bug #15820
mysql-test/r/partition_mgm_err.result:
  Added result block for test of bug #15820