expression rule

Question

I have an expression rule which returns data for some ID's and for some it returns 0 items. Based on this rule, I need to display a message to the user. If it returns 0 items, then "in progress". If not, the usual data. 
 How to check if the rule returns some value or 0. I used isnullorempty, but it didn't work

Mike Schmitt · Answer

post code snippet

Anna P · Answer

try with this code, 
 create a common rule to check isnull or not and use that rule, 
 a!localVariables( local!keys:getkeysfromdictionary(ri!data), local!isAllEmpty: a!forEach( items: local!keys, expression: a!isNullOrEmpty(index(ri!data,fv!item,null)) ), not(contains( local!isAllEmpty, false())) )