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Description
Improve the error info when pass guest doesn't exist on rhev to remote-viewer

Version:
virt-viewer-0.6.0-11.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Prepare a guest on rhev(rhevm.example.com), and add user "admin" to virtual machine permissions
2. On remote-viewer client,pass an guest name which doesn't exist,eg:test doesn't exist on rhev.
# wget http://rhevm.example.com/ca.crt
# remote-viewer --ovirt-ca-file=ca.crt ovirt://admin%40internal.com/test
3.After input the right password,an dialog will pop out with error:"Could't open Ovirt session".
In the console,error info shows as below:
(remote-viewer:32390): remote-viewer-CRITICAL **: create_ovirt_session: assertion 'vm != NULL' failed


Actual results：
In step 3,the error info is quite confusing and not clear,actually users just pass guest which doesn't exist on rhev instead of NULL guest.

Expected results:
Improve the error info in step 3 to be more clear and not so confusing.

Additional info:

Upstream is now showing a dialog to select the VM to connect to when an invalid VM name is given. I thought before that there had been a patch to give a better error when giving an invalid VM name, but I haven't been able to find it.

Tested with:
virt-viewer-0.6.0-12.el7.x86_64

Following the steps in description:

On remote-viewer client,pass an guest name which doesn't exist,eg:test doesn't exist on rhev.

After input the right password,an dialog will pop out with error:"Could't open Ovirt session".
In the console,No error info shows as description.

Refer to the above comments,move the bug 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-2015-0295.html