labels and multiple class items

[Keith Sibson]

For a layer with mutiple classes and a labelitem, labels are shown for
both those classes that have a label object AND those that don't. In the
latter case, a default label object seems to be applied.

I was attempting to implement behaviour whereby a label would be rendered
only if a particular class expression were true. Is there any motivation
behind the use of a default label object? I would have thought that in the
absence of a label object, not rendering a label for that class would be
more appropriate behaviour.

Regards,

Keith.