null value come s after the append function.

Ri allselectedactions shows a null value on click of two radio buttons and submit button .  

Attached append snippet 

a!columnLayout(
contents: {
a!radioButtonField(
label: "Refund Case Not Created Status" ,
labelPosition: "ABOVE",
choiceLabels: {
"Found the Case",
"Not Found the Case"
},
choiceValues: {
"Found",
"Not Found"
},
value: local!RefundCaseNotCreatedChoice,
saveInto: {
local!RefundCaseNotCreatedChoice,
a!save(
local!allSelectedActions,
append(
{
local!allSelectedActions
},
{
local!RefundCaseNotCreatedChoice
}
),

)
},
showWhen: if(
local!checkNotissuedChoice = "Refund Case Not Created",
true(),
false()
),
required: true,
choiceLayout: "STACKED",
validations: {}
)
}
),

Submit code 

a!buttonWidgetSubmit(
label: cons!APAC_TEXT_ACTIONS[1],
confirmMessage: "Are you sure you want to submit?",
value: cons!APAC_TEXT_ACTIONS[1],
saveInto: {
ri!buttonAction,
a!save(
ri!allSelectedActions,
append(
local!allSelectedActions,
ri!allSelectedActions
)
)
},
style: "PRIMARY",
skipValidation: true()
)