[7.8] [Ingest Manager] Fix datasource validation for streams without vars (#67950)#68151

Merged

nchaulet merged 1 commit intoelastic:7.8from nchaulet:backport/7.8/pr-67950

Jun 4, 2020

+100-33

Commits on Jun 3, 2020

[Ingest Manager] Fix datasource validation for streams without vars (elastic#67950 )
nchaulet
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