MetaReader: get nentries from EventStreamInfo rather than DataHeader
In context of @gemmeren 's comment in https://its.cern.ch/jira/browse/ATEAM-973
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Will need a rebase after !70313 (merged)
Edited by Maciej Pawel Szymanski
In context of @gemmeren 's comment in https://its.cern.ch/jira/browse/ATEAM-973