What if a custom field is blank

If you’re asking what happens if a Custom Field is used in the status, and the Custom Field’s value is blank, then that part of the status would also be blank.

If you’re asking whether it’s possible to prevent a status from being sent to Buffer if a Custom Field has no value, see Docs: https://www.wpzinc.com/documentation/wordpress-buffer-pro/status-settings/#status–conditions–custom-fields

I am considering buying the Pro version

Please limit the topic to the version here. For pro or commercial product questions please contact the developer directly on their site. This includes any pre-sales topics as well.

https://www.wpzinc.com/support/

That’s not the best link (probably) but what I found after a quick look.

As the developer is aware, commercial products are not supported in these forums. I am sure they will have no problem supporting you there.

Thank you!