MONDRIAN: Fix test CompatibilityTest.testNullCollation on Oracle. Native     TopCount was generating SQL that ordered NULL values incorrectly.
MONDRIAN: Fix test CompatibilityTest.testNullCollation on Oracle. Native
    TopCount was generating SQL that ordered NULL values incorrectly.

[git-p4: depot-paths = "//open/mondrian/": change = 12903]

inevo/mondrian,inevo/mondrian