"Unready links" are links that refer to pages that have not yet been published as fit for the readers to see. (All pages with no content would be automatically included in this category.)
A few clicks to links that are time-wasters will quickly de-motivate users from clicking on any other links. If they are not going to click on links then the potential value of reading content in wiki is completely undermined.
Any unready link is a time-wasting experience that readers should be protected from.