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This bug was initially created as a copy of Bug #1660768

I am copying this bug because: 

This empty password handling regression is now able to be fixed, with code in the 1.3.0 release of gtk-vnc which uses gnutls instead of gcrypt

Description of problem:
Virt-viewer window is closed unexpectedly if keeping password blank, then click OK button for VNC guest

Version-Release number of selected component (if applicable):
virt-viewer-7.0-3.el8.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a vnc guest has authentication required.
2. Open the guest by virt-viewer.
$ virt-viewer -c qemu:///system $vncguest
3. After authentication dialog pops up, keep passwrod blank, and click OK button.

Actual results:
virt-viewer window is closed unexpectedly.

Expected results:
virt-viewer should retry the authentication for the vnc guest.

Additional info:
1) It can not be reprodeced in rhel7.
2) Spice guest has no problem.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: gtk-vnc), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2512