[7.x] [Metrics Alerts] Fix error when a metric reports no data (#59810)#59927

Merged

Zacqary merged 1 commit intoelastic:7.xfrom Zacqary:backport/7.x/pr-59810

Mar 12, 2020

+56-35

Commits on Mar 11, 2020

[Metrics Alerts] Fix error when a metric reports no data (elastic#59810 )
Zacqary
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