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Description of problem:
Cannot create a new guest in virt-manager

Version-Release number of selected component (if applicable):
virt-manager-1.2.1-3.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1. Launch virt-manager.
2. Click the New button to create a new guest.

Actual result:
"Error: 'NoneType' object has no attribute 'guest'" pops up.

Expected result:
The create new guest window should pop up.

Additional information:

Upstream patch proposed:

https://www.redhat.com/archives/virt-tools-list/2015-July/msg00084.html

Upstream commit:

commit cce1f89a345e3837dc79b9aac8af9bfb476b326f
Author: Pavel Hrdina <phrdina>
Date:   Mon Jul 20 09:19:57 2015 +0200

    virtManager/create: update capsinfo sooner in set_conn_state
    
    We need to update/initialize the capsinfo sooner in that function to be
    able to call has_install_options().
    
    Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1244566
    
    Signed-off-by: Pavel Hrdina <phrdina>

*** Bug 1246973 has been marked as a duplicate of this bug. ***

I can reproduce the bug with the build:
virt-manager-1.2.1-3.el7.noarch

Try to verify this bug with package:
virt-manager-1.2.1-4.el7.noarch

steps:

1. Launch virt-manager
2. Click the New button to create a new guest.

Result:
New VM window pops up and create a new guest successfully.
move this bug from ON_QA 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://rhn.redhat.com/errata/RHBA-2015-2206.html