No flask icon is shown for the variant which has an experiment running

This bug has appeared after the extJS removal for Relevance in the Experience Manager.

Steps to reproduce:

1. Go to a channel
2. Select a component
3. Copy the variant
4. Select Dutch segment
5. Go to the Experiment tab
6. Select Goal 1
7. Save
8. Publish the channel, so the experiment can start
9. Go back to the Properties tab
10. Open the variants

Expected result:

The Dutch variant should have a flask next to it in the Variants dropdown

And a flask icon should be displayed in the topbar of the sidepanel as well. 
Note that the icons should appear already when the experiment is created.

Actual result:

No flask icons are present.