Blendstat braks other panels on grafana 7 and 8

[yurividal]

https://community.grafana.com/t/grafana-gauge-bug/49743/3
grafana/grafana#36170 (comment)

[farski]

Thank you for bringing that to my attention. Unfortunately we don't use Grafana where I work anymore, so I don't have much time to work on this code. Also, because of the significant changes to the Grafana API in those versions, any update would basically require a complete rewrite.

More recent versions of Grafana include native math functionality that should make this panel unnecessary, so I would recommend anyone on those versions who are having this problem should switch back to the basic single stat panel and use the transformations functionality on the query.