Cherry-pick #19812 to 7.8: [Bug] fix bug with empty filter values returning no results in system/service#19914

Merged

fearful-symmetry merged 1 commit intoelastic:7.8from fearful-symmetry:backport_19812_7.8

Jul 14, 2020

+50-17

Commits on Jul 14, 2020

[Bug] fix bug with empty filter values returning no results in system/service (elastic#19812 )
fearful-symmetry
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