MONDRIAN: Fix bug 1442110: If Query.getMdxHierarchiesOnAxis() knows what dimension an expression belongs to but not which hierarchy, it now returns the default hierarchy of the dimension rather than null (which was confusing JPivot).
MONDRIAN: Fix bug 1442110: If Query.getMdxHierarchiesOnAxis() knows what dimension an expression belongs to but not which hierarchy, it now returns the default hierarchy of the dimension rather than null (which was confusing JPivot).

[git-p4: depot-paths = "//open/mondrian/": change = 5729]

inevo/mondrian,inevo/mondrian