[7.9] fix empty string in selected indices (#76855)#76903

Merged

jloleysens merged 1 commit intoelastic:7.9from jloleysens:backport/7.9/pr-76855

Sep 8, 2020

+12-7

Commits on Sep 8, 2020

fix empty string in selected indices (elastic#76855 )
jloleysens
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