String literals cannot be set to empty string

Hi Firecloud Team,

When I try to run recapseg, I want to set both

recapseg_workflow.recapseg_tumor_pcov.is_plotting: (String)

and

recapseg_workflow.recapseg_tumor_pcov.no_pon_reduction: (String)

to false in my task configuration.

They are both flags, when they are true they are set to "--is-plotting" etc.
When they are false, they should be set to empty string ""

When I try that (or several spaces etc.), it always converts it to "No value entered" and fails to launch the analysis because the value is not set.