[Mondrian] Cube getTimeDimension use when Cube has no Time dimension

[Richard Emberson]

The Cube interface has the method getTimeDimension()
defined. A common usage pattern appearing in
LastPeriodsFunDef, PeriodsToDateFunDef, XtdFunDef,
OpeningClosingPeriodFunDef and ParallelPeriodFunDef
is:

validator.getQuery().getCube().getTimeDimension().getHierarchy().


If the Cube does not define a Time dimension, then all of these
result in a NullPointerException rather than some
Mondrian usage exception.

Granted, the above functions only make sense if a Time
dimension is defined for the Cube, but there is no check.

Richard

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