[Var_Defined] returns True if a variable has been defined in the current page or False otherwise. Can be used to check if a variable has been defined even if the current value of the variable is Null or the empty string.
Note that this is entered for compatibility and is functionally equivalent to var(var_name)->isNotA(::null).
Use the [Var_Defined] tag with the name of a variable. In the following example, True is returned if the variable Favorite_Color is defined.
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