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fix NULL field in size expression beeing drawn
the expression generated by the assistant was causing symbol with size expr evaluated to NULL to be drawn with default size, wich is not what the default should be. The generated size expression is now composed with coalesce(...,0) so the symbol is not drawn when the size expression is NULL The expression is still recognized without the coalesce to allow the legend to be drawn even in the absence of coalesce: this can be used to have the default size for NULL expression and use a conditional expr fro color to highlight symbols where value is NULL.
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