[rules-users] is null or is not Null failing for a String field check in Guvnor drl

[puja nandamuri]

Hi ,

when using a business rule guided editor ,

for a fact, when I select a string type field from the drl guided editor in Guvnor  and select 
 is null from the dropdown list of operators,

I get the following validation error when I do a validate on the rule.

no viable alternative at input 'null' in rule "Asset_Description_NullCheckRule"

when I do a View Source, it shows the source as 

when
            Asset( description == null null ) 

Is this a bug ? 

if I select the free form drl option and create the when condition as

 Asset( description == null ) , it validates fine.

Thanks,

Ram
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