Description of problem:
I have created a VM from a template.
Then created another storage domain, then I choose the VM disks and pressed move.
The message was "The following disks cannot be moved" - not explaining that disks cannot be moved since the template disks are not at the destination domain.

Version-Release number of selected component (if applicable):
4.1

How reproducible:
Always

Steps to Reproduce:
1.create a VM from a template
2.create another storage domain
3.choose the VM disks and presse move

Actual results:
Get a message "The following disks cannot be moved"

Expected results:
Need an explanatory message such as "The disks cannot be moved - need template disks at target destination"