Suppressed warning says it has no entities when it should

[Sebastiaan127001]

Describe the bug
When the browser has lost its connection, the suppressed warning metric says that it has no entities when it should.

To Reproduce
Steps to reproduce the behaviour:

1. Go to metric Suppressed warnings (SonarQube source)
2. Make sure the metric is collapsed and it has a measured value above 0
3. Make sure the browser lost its connection (reproducible by killing the API-server)
4. Open the entities tab and see that it say it never has entities, where the user should have an error (i.e. I know I there is something to display, and I know for this metric it should be possible, but I cannot fetch the results).

Expected behaviour
Different metrics, like the suppressed warnings metric, should know they are supposed to have entities. When the measured value is above 0 the entities tab should display an error message (⚠️) because it knows that entities should be present, but it cannot show then for some reason (like a connection loss).