Description of problem:

When trying to move disks from UI, the dialog keeps spinning and ui.log 
throws a JavaScriptException: 'Cannot read property 'G' of null'



Version-Release number of selected component (if applicable):

rhvm-4.2.5.4-0.1.el7ev
vdsm-4.20.35-1.el7ev

How reproducible:

100 % in customer's environment

Steps to Reproduce:
1. Get a working VM based on a template
2. Click on the 'Move' button in UI


Actual results:

Move Disks dialog keeps spinning and does not provide any information

Expected results:

Dialog should pop-up and let you continue with disk move flow


Additional info:

The VM had 2 snapshots referenced in DB, 1 for Live Storage migration which
didn't exist or is not associated to any volume



Workaround:
===========

Use the API to move the disk between storage domains

~~~
curl \
--cacert '/etc/pki/ovirt-engine/ca.pem' \
--user '$USER@$DOMAIN:$PASS' \
--request POST \
--header 'Version: 4' \
--header 'Content-Type: application/xml' \
--header 'Accept: application/xml' \
--data '
<action>
  <storage_domain id="$sdUUID"/>
</action>
' \
https://$ENGINE-FQDN/ovirt-engine/api/disks/$imgUUID/move
~~~