Show list if it is different from null

I am trying to make these rules show if they are different from null. 
How can it be done?
thankss

rule!Revis(
auto: ri!autor,
day: if(
ri!line = 1,
ri!queb.fDr,
ri!queb.fDiOpe
),
opinion: ri!coment,
perfil: ri!line
),

if(
not(ri!queb.typeQueb = "Client"),
rule!GDQ_IF_MostrarRiesgo(
nOne: ri!queb.one,
nTwo: ri!queb.two,
nThree: ri!queb.three
),
{}
),

if(
and(
ri!line = 2,
not(ri!queb.typeQueb="Client2")
),
rule!Impact(
impactRep: ri!queb.impactRep,
level: ri!level
),
{}

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