52c0121890
When there is an empty result set, the Prometheus server replies with
{"status":"success","data":{"resultType":"vector","result":null}}
That "null" reply was not handled correctly by the graphing library.
This commit handles that case and shows "no data" in the UI console view
instead of throwing an error in the browser javascript console.
Fixes #3515
Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
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