[Zope] why a xcatalog keywordindex is mandatory?

[Yurj]

I've this in the form input of a zcatalog query:

<tr><td>Collocazione AND</td>
<td><textarea name="COLL2.query:lines:record" rows="3" cols="40"></textarea>
<input type="hidden" name="COLL2.operator:record" value="and">
</td></tr>

where COLL is a keywordindex. All works if I put something in the textarea.
But if it is empty, it finds nothing instead of all, as other records.

Help :)

I've tried to change, in the form, COLL with COLL2 and do in the report
script:

<dtml-call "REQUEST.set('COLL',_['COLL2'])">

but it gives error (Error Type: TypeError
Error Value: object has read-only attributes)

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