[mapserver-users] null value renders in pie chart

[Steve.Toutant at inspq.qc.ca]

Hi,
I created a layer that renders pie chart with 4 classes.

The problem is some classes are render in the pie even if there is no data 
(null). That means I always have 4 slices in the pie.
How can I remove the slices with null value?

I tried using EXPRESSION without success. I specified > 0 since I think 
"is not null" is not supported
CLASS
        NAME "Cri"
        EXPRESSION ([cri] > 0)
        STYLE
                SIZE [cri]
                COLOR 215 48 39
        END
END

thanks for your help,
Steve
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