[Zope] dtml-if question

[Oops Oops]

I guess i did something wrong on this, so it's not
work?

<dtml-if expr="objectValues('newclient')==''">
 <br> Null
<dtml-else>
 <br> Not Null
</dtml-if>

My idea is to test if Zobject-newclient exist in this
folder or not.
But i always get "Not Null" even tho I'm sure there is
no newclient exist in the folder.

Can someone help me to fix this?

Thanks



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