[TEST]  NonEmptyTest.testNativeWithOverriddenNullMemberRepAndNullConstraint makes a runtime modification of NullMemberRepresentation, and then verifies it can use that representation to query.  The  property isn't intended for runtime modification,
however, since there could be members cached with the previous representation.  To eliminate the risk of testing against an already
populated cache, use a fresh connection.
Merge pull request #336 from mkambol/testNullMem

[TEST]  NonEmptyTest.testNativeWithOverriddenNullMemberRepAndNullConstra...