validator

[fea jabi]

<field property="amt" depends="validwhen">
     <msg name="validwhen" key="lbl.notvalidnumber"/>
     <var>
           <var-name>test</var-name>
                   <var-value>( ((*this* == "") or (*this* != null)) and 
(*this* >= 0) )</var-value>
     </var>
</field>
want the value to be greater than 0, but can be empty or null. Also no chars 
are allowed.

trying using above. but the error gets shown when is a null or empty value.

how to fix this?

Thanks.

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