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Description of problem:
When use EDGE to create VMs with url, there is a Oops on UI. The machine created by url isn't shown on UI, but it can be listed out by virsh cmd.


Version-Release number of selected component (if applicable):
cockpit-machines-184.1-1.el8.noarch
libvirt-dbus-1.2.0-2.module+el8+2704+d2eddeb5.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Use EDGE and log in the cockpit
2.Create a machine with url on Virtual Machines page 

Actual results:
1.There is an Oops on UI.
2.The machine isn't shown on UI.
3.The virsh cmd `virsh list --all` can get the information of the machine.

Expected results:
User can create the VMs wth url on EDGE

Additional info:
The information of Oops:
Cockpit had an unexpected internal error.You can try restarting Cockpit by pressing refresh your browser.

the information of javascript console:
SCRIPT5007: SCRIPT5007: Unable to get property 'nodeValue' of undefined or null reference       machines.js(67140,455)

I tried to reproduce this with trying to create a VM with this URL: https://dl.fedoraproject.org/pub/fedora/linux/development/30/Server/x86_64/os/

I also get an Oops, but it looks different first: "SCRIPT5: SCRIPT5: Access is denied". But a few seconds later I get the same oops as you. So this reproduces fine on our Windows 10 test image.

Thanks!

Fixed in https://github.com/cockpit-project/cockpit/pull/11639

Yunming, can you please QA ack?

Test Versions:
cockpit-machines-193-1.el8.noarch
libvirt-dbus-1.2.0-2.module+el8.1.0+2983+b2ae9c0a.x86_64

Test Steps:
1.Use the browser which is 'EDGE' and login the cockpit
2.Create a machine with url on Virtual Machines page 

Test Results:
The creation is successful and the installation is also successful. 


According to the results, The creation by using url on the EDGE is successful.So move the status to VERIFIED.

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, 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-2019:3325