Var1 = A unless Var2 is defined

Hello

In Engine file, any way to se0t: Parameter1 = ValueA UNLESS Parameter2 exist ?

In Ruby, it would be:

Parameter1 = ValueA unless Parameter2?

Maybe the "condition" can help ?

add fixed data=Parameter1 = ValueA

add fixed data condition=Parameter2

Thank you Sven,

So, can you please confirm that, IF parameter2 exist, then, Parameter1 will NOT be set ?

oh wait, you have to negate it then.

add fixed condition=!parameter2

ok, this is what is was guessing.

Thank you, it make sens.