Expand testing of QDateTime's isNull() and isValid()

Bring out the asymmetry between date and time more clearly; when date
is valid, an invalid time is ignored in favor of QTime(0, 0). At the
same time, eliminate an un-needed variable from the code that
implements this special handling. (Left over from when the QTime was
passed by const ref, rather than by value.)

Change-Id: I81d8a9026cbb7887a8c638a2761b3db54c088af7
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

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