Description of problem:
"No data available" shows on Virtualization overview metrics chart.

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

How reproducible:

Steps to Reproduce:
1. create a few running VMs in a project
2. View Virtualization overview page
3.

Actual results:
There are numbers shows in the chart, but no graph counts.

Expected results:
It shows the graph counts since there are data available.

Additional info: