(revision-id: kristofer.pettersson@sun.com-20091019074333-g2ces0lo4c2ejar7),
because it broke the tree and was reverted later.

Fix partition_column.test.

Fixed a use of non-initialised variable, cannot use NULL flags if RANGE == NO_MAX_RANGE or NO_MIN_RANGE, so need to check NULL flags after checking the RANGE isn't NO_MAX_RANGE