ARG_TYPE_GROUP_SET doesn't accept empty values about argbash

[matejak]

Great, thank you for reporting this! The repeated arguments behavior is a bit tricky (see #12 ), but there is an obvious problem with the misleading error message.
I also assume that you have allowed passing empty values to the option only in order for the script to work if the option was not passed. In other words, you don't intend to pass empty values to the option on the command-line. Is it like that?

[pbabinca]

I also assume that you have allowed passing empty values to the option only in order for the script to work if the option was not passed. In other words, you don't intend to pass empty values to the option on the command-line. Is it like that?

Yes, ideally I'd love have that option optional. Empty value was just an other attempt to make it working somehow.

[matejak]

The argument validation should be performed during the assignment (now it is done after all assignments). This will take a little longer to fix, but it is surely a step in a right direction.
Thank you again, your use case very nicely exposes this minor design flaw.
Anyway, your example should now work with the master argbash.

[pbabinca]

Thanks! I confirm this works as advertised now.