[7.10] [Ingest Manager] Fix package upgrade breaking after first rollover before new data has arrived (#79887)#80232

Merged

neptunian merged 1 commit intoelastic:7.10from neptunian:backport/7.10/pr-79887

Oct 13, 2020

+108-79

Commits on Oct 12, 2020

[Ingest Manager] Fix package upgrade breaking after first rollover before new data has arrived (elastic#79887 )
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