Try this: 

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

!variable not defined
<<tobilogic "Okay! variable not defined">>

!variable defined
<$set name="variable" value="OK! variable defined">
<<tobilogic "Wrong! variable not defined">>
</$set>



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