Check calo bank size

Carla Marin Benitorequested to merge
cmb_checkBnkSize into master

Skip the bank if the data is empty

Needed to avoid crashes observed in the calo monitoring since 12.07, see eg. https://lblogbook.cern.ch/Shift/4287

FYI @jmarchan @dzuliani @gvouters

Edited by Carla Marin Benito

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