[7.2] Fix: handle null argument values (#37411)#37416

Merged

w33ble merged 1 commit intoelastic:7.2from w33ble:backport/7.2/pr-37411

May 29, 2019

+2-2

Commits on May 29, 2019

Fix: handle null argument values (elastic#37411 )
w33ble
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