add PrCheckEmpty FilterPredicate (end decision for the scheduler)

Niklas Stefan Nolterequested to merge
NN_4scheduler into master

useful for scheduling with LHCb!1422 (merged)

also added the possibility of a sharedobjectscontainer as input for the trackeventfitter (for the barrier)
Can factorize this out if wanted.

Edited by Niklas Stefan Nolte

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