Empty strings cannot be assigned to macros by the Set Macro operator or by the macros list parameter of the Execute Process operator.
The Set Macro operator's shortcoming is not a big problem since we can easily work around using "" in Generate Macro.
However, it is a bit troublesome that the Execute Process operator cannot define empty macros.
(There are workarounds of course but they are not nice.)
Best,
Isak
Best, Marius