I tried this, but it did not work. I also do not see this select_text attribute anywhere in your docs btw.
See the screenshots to better understand what I'm doing.
1) I created a custom field (dropdown) named color and added values to it and made it required.
2) In a CRED form I want to show a blank first value (- Select Color -) so that the form won't submit if the user doesn't select a color
3) The dropdown in the frontend does not include the first default value I set above, it will just populate the dropdown with the values and preselect the first value (White) by default, therefore this field won't validate for empty values
