BUG#18752: Added test case for SHOW CREATE TABLE not showing NULL values properly in bug already fixed
Added new test case for bug 18752 (bug already fixed by previous patch)


mysql-test/r/partition.result:
  Added new test case for bug 18752 (bug already fixed by previous patch)
mysql-test/t/partition.test:
  Added new test case for bug 18752 (bug already fixed by previous patch)