how to not call a macro if the varialbe is null?

I am calling a macro like this:

<@u.listUsers users variable2 variabe3 />


And inside of listUsers.ftl I have:

..
..

 <@v.someThing varaible2 />


Now say variable2 is null, is it possible to do soething like:

if variable2 != null
{
   <@v.someThing variable2 />
}


meaning, don't call this macro if the varialbe is null.

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