api/series: return an empty array iff no results #1327
Merged
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Prometheus' /series end-point returns an empty array no matter what: if
there were results or not. We need to follow the same principle in
Thanos as well because our users depend on it.
The same fix has been applied as here:
https://github.com/prometheus/prometheus/blob/fef150f1b5e48652ec6779e2129ae9a0cf13db8a/web/api/v1/api.go#L506
Tests have been updated to account for this difference and plus one test
has been added just for this case.
Closes #1325.