While printing to PDF, there is no visible indication of whether the print job is completed, or whether it is still going on. This means one has to manually check if the printed file is present and openable to find out if the print is completed and it is safe to close okular. Either a progress bar, or a dialog box to tell the user that the print job is successfully completed would be useful.
*** This bug has been marked as a duplicate of bug 59025 ***