Should you want the other logic: Use the variable as a fallback:

\define otherlogic(parameter)  <$list filter="[[$parameter$]]"><$view field=
"title">$(variable)$</$view></$list>

<$set name="variable" value="Variable used">

!No Parameter
<<otherlogic>>

!With Parameter
<<otherlogic "Okay! Parameter found">>
</$set>

Please note that the usual caveats in regards to square brackets in 
variable or parameter apply.

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