Invalid index (1) for list: valid range is empty

Question

Hi Team, 
 How do we check if the dictionary has one of the value as null. 
 ERROR 
 ----------

Expression evaluation error at function a!forEach [line 8]: Error in a!forEach() expression during iteration 2: Expression evaluation error in rule 'config_temp': Invalid index (1) for list: valid range is empty

Eg: 
 dict1: { 
 field1:"value1", 
 field2:"value2", 
 field3:"" 
 } 
 
 Now, in my logic I'm trying to get each field value and storing in a variable. 
 index(local!data,"field3",null())

Mathieu Drouin · Accepted Answer

a!localVariables(
 local!dictionary: {
 field1: "value1",
 field2: "value2",
 field3: null,
 field4: "value4",
 field5: null
 },
 reject(
 fn!isnull,
 a!forEach(
 items: a!keys(cast(typeof(a!map()), local!dictionary)),
 expression: a!localVariables(
 local!value: index(local!dictionary, fv!item, null),
 if(a!isNullOrEmpty(local!value), fv!item, null)
 )
 )
 )
)