[mlz] suppressing output in bibliography

How can I suppress a type of items (legislation specifically) from showing up in bibliography, as MLZ does to "classic" automatically?

I've been using the following code in twlaw:
<layout locale="zh" suffix="。">
<choose>
<if type="legislation"/>
<else-if match="any" type="treaty" variable="jurisdiction">
<text macro="jurisdiction-filter-zh"/>
</else-if>
<else>
<text macro="tw-secondary-first"/>
</else>
</choose>
</layout>

but never tested it. Realized just now that it wouldn't work. MLZ gives me the following error message if a statute is cited:
[CSL STYLE ERROR: reference with no printed form.]
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