only_if list in km3pipe module

only_if currently can be passed one string only, and the module is skipped in case the object is not in the blob. A useful enhancement would be to extrend only_if to take a list of strings.

My use case: module to calculate track-shower variables: only_if=["track_reco", "shower_reco"] Expected behaviour: only execute module if track_reco && shower_reco are present in the blob

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